A simple prompt structure for better Nano Banana results

The easiest way to improve outputs

Most weak generations come from prompts that are too vague. You do not need an extremely long prompt, but you do need enough structure to guide the model.

A practical format is:

subject + setting + style + lighting + purpose

Example

Instead of writing:

banana poster

write:

a premium banana mascot on product packaging, clean studio backdrop, glossy commercial style, soft directional lighting, designed for an ecommerce hero banner

Why this works

Each section reduces ambiguity:

• subject tells the model what the main object is
• setting tells it where the scene happens
• style tells it how polished, playful, realistic, or illustrative it should feel
• lighting affects mood and clarity
• purpose helps the model bias toward a composition that fits the final use

Good prompt habits

• Start with one strong subject
• Add only one or two style ideas at first
• Mention the final use case, such as cover, banner, or poster
• Regenerate after small edits instead of rewriting everything

When to use a reference image

Use a reference image when composition matters more than idea exploration. A reference helps when you already know the framing or product angle you want, but still need new visual treatment.

Final advice

The best prompt is usually not the longest one. It is the one that gives the model a clear job. If you can describe the subject, scene, look, and intended output in one sentence, your results usually improve fast.