Prompt polish → Generate → Batch variants

1. Refine the prompt: click the wand in the chat bar's prompt field and tell the AI what you are after — each reply proposes a rewritten prompt, and you keep iterating in the same field. Click Use this prompt to accept it back into the chat bar. See Sketch pipelines & prompt tools.
2. Set the batch count: with the category on Image, use the N image pill (1–4; available to paid users). The chat fans one send into N generations.
3. Vary a parameter (optional): with the count at 2 or more, the picker shows Vary parameter — pick a parameter via the eyedropper and assign a ± delta so each variant sweeps that value across a range.
4. Generate. Results land as image nodes on the board.

Note: prompts you like can be saved as favorites (the save/bookmark control in the chat) and re-applied later. Built-in prompt presets are also available from the presets popover and fill the chat bar with a ready prompt. See Chat bar: generating images.