On the homescreen, select Generate image.
In the Prompt field, enter a text description of the image you want to generate.
Select Model in the options bar, and then select Gemini 3.1 (Nano Banana 2) or Gemini 3 (Nano Banana Pro) from the Partner models tab.
Select Aspect ratio in the options bar, and then select the required width-to-height ratio.
Select Resolution in the options bar, and then select the required resolution.
To use an image as a reference for a more refined output, select Image in the options bar and then upload it.
Select Generate in the Prompt field to generate the image.