Generate optimized prompts for Gemini 2.5 Flash Image (Nano Banana). Use for image generation, crafting photo prompts, art styles, or multi-turn editing workflows with best practices.

Nano Banana Image Prompt Generator Generate high quality prompts for Gemini 2.5 Flash Image using proven best practices from October 2025. Core Principle Describe scenes naturally, don't list keywords. ❌ woman, business suit, office, professional ✅ A professional businesswoman in navy suit stands confidently in modern glass walled office overlooking city skyline. Warm afternoon light streams through windows. Prompt Structure Basic Template Components 1. Subject & Action Who/what and what they're doing 2. Setting Where the scene takes place 3. Lighting Natural/artificial light sources and quality 4. Mood Emotional tone or atmosphere 5. Technical Details Camera, lens, style specifics 6. Format Aspect ratio or dimensions Prompt Length Short (10 20 words) : Quick generation, minimal control Medium (50 100 words) : ⭐ RECOMMENDED balanced control Long (100 200 words) : Maximum control for complex scenes Photography Prompts Template Camera Control Lenses: 35mm, 50mm (standard) 85mm portrait (close ups) 10 24mm wide (landscapes) 60 105mm macro (details) Lighting: Golden hour (warm, soft) Blue hour (cool, atmospheric) Three point (studio) Dramatic side (high contrast) Rembrandt (classic portrait) Settings: Shallow DOF: f/1.4 2.8 (blurred background) Deep focus: f/11 22 (everything sharp) Motion blur for action Example Art & Illustration Prompts Template Common Styles Watercolor painting Digital art Oil painting Pencil sketch Ink drawing Anime/manga Pixel art Minimalist vector Example Text Rendering Best Practices: Keep under 25 characters total Maximum 2 3 phrases Specify font style (bold, script, sans serif) Put exact text in quotes Describe position explicitly Example: Multi Turn Editing Workflow Nano Banana excels at conversational editing. Make one change at a time. Example sequence: 1. "Create professional headshot of woman in business attire" 2. "Change background to modern office" 3. "Make her wearing glasses" 4. "Add warmer lighting" Product Photography Template Example Landscape Photography Template Example Abstract Art Template Example Common Pitfalls Avoid: Keyword lists without context Vague descriptions Conflicting style instructions Overly complex text rendering Too many simultaneous changes in edits Instead: Use complete sentences Be specific about details Maintain style consistency Keep text simple Edit iteratively Style References When requesting specific artistic styles, reference: Art movements (impressionism, art deco) Artists (in style of Van Gogh's brushwork) Media (watercolor, oil painting, digital art) Eras (1950s photography, modern minimalist) Aspect Ratios 1:1 Square (social media, profile pics) 16:9 Landscape (presentations, headers) 9:16 Portrait (mobile, stories) 4:5 Portrait (Instagram posts) 2:3 Classic portrait 3:2 Standard photo Quick Prompt Checklist ✅ Subject clearly described ✅ Action or pose specified ✅ Environment/setting detailed ✅ Lighting source and quality ✅ Mood or atmosphere ✅ Style or technical specs ✅ Aspect ratio chosen ✅ Complete sentences, not keywords Common Issues & Solutions Prompt Quality Issues Issue : Generic or vague output Cause : Prompt too short or lacks specificity Solution : Expand to 50 100 words. Add lighting details, mood, and specific technical specs (lens, style, etc.). Example : ❌ Too vague: "A woman in an office" ✅ Specific: "Professional businesswoman in navy suit stands confidently in modern glass walled office overlooking city skyline at golden hour. Warm afternoon light streams through floor to ceiling windows creating soft rim lighting. Shot with 50mm f/2.0, shallow depth of field blurs cityscape background. Confident yet approachable mood. 4:5 portrait format." Issue : Conflicting style instructions Cause : Mixing incompatible styles (e.g., "photorealistic watercolor") Solution : Choose one primary style. For photography, use camera terminology. For art, use medium/technique terminology. Issue : Text rendering failures Cause : Too much text, complex fonts, or unclear positioning Solution : Limit to under 25 characters total Use simple, clear fonts (bold, script, sans serif) Specify exact position ("at top", "centered", "bottom right") Put text in quotes: "SUMMER" Issue : Unwanted elements in image Cause : Ambiguous phrasing or conflicting descriptors Solution : Be explicit about what should NOT appear. Use precise, unambiguous language. Generation Issues Issue : Image doesn't match prompt Cause : Prompt too complex or contradictory elements Solution : 1. Simplify prompt to core concept 2. Use multi turn editing workflow 3. Start basic, refine iteratively Issue : Inconsistent results across generations Cause : Vague descriptors allowing wide interpretation Solution : Add specific details about colors, materials, lighting angles, camera settings, and composition rules (rule of thirds, golden ratio). Issue : Poor composition Cause : No compositional guidance in prompt Solution : Explicitly mention composition rules: "Rule of thirds composition" "Centered subject with symmetrical framing" "Leading lines draw eye to focal point" "Foreground, mid ground, background layers" Multi Turn Editing Issues Issue : Too many changes at once causing confusion Cause : Requesting multiple edits simultaneously Solution : Make one change per turn. Wait for result before next edit. Example sequence : 1. ✅ "Change background to sunset" 2. ✅ "Make the lighting warmer" 3. ✅ "Add reflections on water" vs. 4. ❌ "Change background to sunset with warmer lighting and add reflections" Issue : Losing context from earlier turns Cause : Vague references without reinforcing key details Solution : Briefly reinforce context: "In this mountain landscape, add a hiking trail in the foreground" Prompt Validation Before submitting a prompt, verify: Content Completeness [ ] Subject clearly identified (who/what) [ ] Action or state described (what subject is doing) [ ] Environment/setting specified (where) [ ] Lighting described (source, quality, direction) [ ] Mood or atmosphere indicated (emotional tone) [ ] Style or medium specified (photography, watercolor, etc.) [ ] Aspect ratio chosen (1:1, 16:9, 4:5, etc.) Technical Specifications For Photography: [ ] Camera/lens mentioned (50mm, 85mm, wide angle) [ ] Camera settings if relevant (f/2.8, shallow DOF) [ ] Lighting type (golden hour, studio three point, dramatic side) [ ] Shot type (close up, wide shot, overhead) For Art/Illustration: [ ] Medium specified (watercolor, digital art, oil painting) [ ] Technique mentioned (loose brushstrokes, sharp vector) [ ] Color palette described (pastels, vibrant, monochrome) [ ] Style reference if applicable (children's book, manga, minimalist) Quality Checks [ ] Uses complete sentences, not keyword lists [ ] Specific rather than vague ("charcoal blazer" vs. "suit") [ ] No conflicting style instructions [ ] Text under 25 characters if included [ ] Length appropriate: 50 100 words for balanced control [ ] No contradictory elements (photorealistic watercolor) Text Rendering Validation If prompt includes text: [ ] Total characters under 25 [ ] Maximum 2 3 text phrases [ ] Text in quotes ("SUMMER") [ ] Font style specified (bold, script, sans serif) [ ] Position explicitly stated (top, bottom, centered) [ ] Text color contrasts with background Testing Your Prompts Quick Test Generate image and evaluate: 1. Subject accuracy : Is the main subject as described? 2. Composition : Does layout match prompt intent? 3. Lighting : Is lighting source and quality correct? 4. Style : Does aesthetic match requested style? 5. Technical specs : Are camera/art specs honored? 6. Mood : Does image convey intended atmosphere? Refinement Workflow If image doesn't match expectations: Step 1: Identify the gap What element is wrong/missing? Is it subject, lighting, style, composition, or mood? Step 2: Use multi turn editing Don't regenerate from scratch Make targeted edit: "Make the lighting softer" One change at a time Step 3: Refine prompt for future use If you need to regenerate, add more specificity to weak areas Save successful prompts as templates Comparison Test For critical images, generate 2 3 variations with slightly different prompts: Version A : Medium detail (50 75 words) Version B : High detail (100 150 words) Version C : Different style/lighting approach Compare results to find optimal prompt verbosity and approach. Example: Complete Validation Prompt : Validation : ✅ Subject: elderly fisherman ✅ Action: mending fishing net ✅ Environment: wooden dock at harbor ✅ Lighting: golden hour, rim lighting ✅ Mood: contemplative, peaceful ✅ Technical: 85mm f/2.0, shallow DOF ✅ Aspect ratio: 4:5 portrait ✅ Complete sentences: yes ✅ Specific details: weathered hands, wooden dock, misty harbor ✅ Length: ~85 words (optimal range) ✅ Style consistency: photorealistic throughout Expected result : High quality, detailed image matching all specifications. Troubleshooting Guide Problem Likely Cause Fix Blurry/low quality Missing technical specs Add camera, lens, "ultra high resolution" Wrong colors Vague color description Specify exact colors, hex codes if needed Bad composition No compositional guidance Add "rule of thirds", "centered", etc. Missing elements Element mentioned too late Put critical elements early in prompt Generic look Keyword listing Rewrite as natural sentences Text garbled Too much text Reduce to <25 chars, simplify font Wrong style Conflicting instructions Choose one consistent style Unexpected objects Ambiguous phrasing Be more explicit and specific

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