How to use AI photo prompts in Gemini (Nano Banana), step by step

Upload your photo, paste a prompt and get the edit in Gemini. The exact steps on Android, plus tips to keep your face the same.

Google Gemini's image model (often called Nano Banana) can edit your own photo from a text prompt. It's free in the Gemini app, and the trending saree, figurine and retro looks you see on Instagram are made this way.

Steps

1. Open the Gemini app (or gemini.google.com) and sign in with your Google account.
2. Tap + and choose a clear photo of yourself: face visible, good light, no heavy filter.
3. Copy a prompt from PromptLens and paste it into the message box.
4. Send. Gemini returns the edited picture in a few seconds. Tap it to download.
5. Not quite right? Reply with a short fix such as "keep my face exactly the same, only change the background".

Tips for better results

• One person, front-facing. Group photos confuse the model. Crop to one face first.
• Say what must not change. Good prompts include a line like "keep the face, skin tone and identity unchanged". Every PromptLens photo prompt already has it.
• Set the aspect ratio. 4:5 for Instagram posts, 9:16 for stories and status.
• Regenerate, don't rewrite. If the first result is close, ask for one change at a time.

Is it free?

Yes, Gemini gives free image edits every day, with a higher limit on paid plans. PromptLens is free too: it only gives you the prompts, so there's nothing to pay and no photo upload to us.