How to Write Nano Banana Prompts: A Stable First Frame in 15 Minutes

This tutorial focuses on one skill: writing Nano Banana prompts so a beginner can get a directionally correct first frame in about 15 minutes. Ideal if you are new to Nano Banana (Gemini 2.5 Flash Image) for text-to-image / AI art.

Learning Goals

By the end you will be able to:

• Write one clear prompt with a fixed structure
• Decide whether a first frame is “good enough” instead of regenerating blindly
• Apply one short edit instruction for a minimal fix

What You Need

• Access to the Nano Banana workbench (start from nanobanana-ai.us)
• A simple subject (coffee cup, product bottle, window portrait—anything concrete)
• About 15 minutes

Workbench entry:

https://app.nanobanana-ai.us/en/generate/image-tools/nano/

Step 1: Memorize the Prompt Formula (2 Minutes)

When writing AI art prompts, do not start by stacking adjectives. Write in this order:

1. Subject (the person or object that matters most)
2. Action / state (optional)
3. Scene / environment
4. Style (photoreal, illustration, product photography, etc.)
5. Lighting (direction, soft/hard, time of day)
6. Lens / framing (close-up, wide, eye-level, shallow depth of field)

Mantra: clear subject → grounded light → one style. That beats “beautiful, 8k, masterpiece” for Nano Banana.

Step 2: Fill the Template (3 Minutes)

Copy this skeleton and replace the brackets:

[subject], [scene], [style], [lighting], [camera feel]

Example A: Product still life

Ceramic pour-over coffee pot on a walnut table, high-window side light, soft shadows, shallow depth of field, realistic product photography

Example B: Portrait mood

A short-haired woman standing on a rain-washed street, 85mm portrait, neon reflections, wet asphalt, natural expression, cinematic contrast

Before you generate, check: would a stranger instantly know who/what the subject is, where they are, and what the light feels like? If not, fix subject and scene first—do not pile on style words.

Step 3: Generate and Run the Three-Question Check (5 Minutes)

Paste the prompt in the workbench and generate 1–2 images. For each frame, ask only:

1. Is the subject correct?
2. Is the composition usable?
3. Does the lighting mood feel close?

If two of three pass, keep it. If all fail, regenerate. Do not grind ten edits on a wrong direction—that is the most common time sink when practicing Nano Banana prompts.

Step 4: One Short Edit (4 Minutes)

Once the first frame points the right way, change one thing only, for example:

Keep the subject unchanged. Change only the background to a dusk shoreline.

or:

Soften the key light a bit; leave everything else as unchanged as possible.

Good text-to-image prompts set direction; short conversational edits tighten the result.

Step 5: Save Your Personal Template (1 Minute)

Store today’s working prompt as a template and label the use case (product / portrait / cover). Next time, swap only subject and scene—reuse style and lighting. That habit is how Nano Banana prompts get more stable over time.

Common Mistakes

Weak approach	Stronger approach
Vague adjective piles	Name subject, materials, light direction
Mixing three styles at once	Pick one primary style
Long unstructured walls of text	Compress with the six-part formula
Changing five things per turn	Change one priority per turn

Practice Checklist (Finish Today)

• Write 1 product-style prompt with the formula and generate
• Write 1 portrait/scene prompt with the formula and generate
• Apply 1 single-point conversational edit to a passing first frame
• Save 1 reusable template

Wrap-Up

How do you write Nano Banana prompts? With structure, not superstition: subject → scene → style → lighting → lens. Your beginner goal is not one-shot perfection—it is a stable first frame in 15 minutes, then conversational polish until it is publishable.

Next, try the on-site conversational editing and character consistency tutorials—or return to the workbench and run two more subjects with the same formula.