Nano Banana prompt guide: consistent results

The core framework

The most stable structure is:

Subject + Scene + Style + Constraints

This order helps the model lock identity first, then apply the environment and aesthetic.

Example prompt

same person, rooftop at sunset, cinematic lighting, teal/orange grade, keep face and hairstyle, do not change outfit

Constraints that matter

These simple phrases dramatically improve consistency:

• “keep face” / “preserve identity”
• “keep pose” / “do not change outfit”
• “do not change logo” / “keep text intact”

If you don’t specify constraints, the model may improve the image in ways you didn’t intend.

Layout control

When layout matters (posters, product shots), be explicit:

• “subject centered with headroom”
• “product on the left, empty space on the right for text”
• “top 20% empty for headline”

Style clarity

Use concrete style cues instead of vague adjectives:

• “softbox lighting”
• “cinematic teal/orange grade”
• “minimalist studio background”

Vague prompts like “nice” or “modern” are less reliable.

Reference image strategy

1 strong reference is better than many weak ones.

Recommended:

• 1 identity reference
• 1 optional style reference
• Avoid over‑compressed or heavily filtered images

If you use multiple references, describe their roles.

Batch vs single outputs

Batch generation helps you compare options quickly. Once you find a good direction, switch to single‑image refinement for control.

Fixing common issues

Identity drift
Add “keep face,” “preserve identity,” and re‑upload a clean reference.

Inconsistent lighting
Specify the light source and time of day.

Typography issues
Switch to Nano Banana Pro and specify font style + placement.

Prompt templates you can reuse

Product hero
product on seamless white, softbox lighting, subtle shadow, keep logo intact

Fashion portrait
same person, studio lighting, 50mm lens look, keep face and hairstyle, do not change outfit

Travel poster
illustrated city skyline, dusk lighting, bold headline at top, keep layout consistent

Quick checklist

• Clear subject
• Specific style
• Explicit constraints
• Simple layout instructions
• Strong reference image

Final note

Nano Banana is an image model (no video output). The best prompts are short, specific, and consistent across iterations.