Prepare a clear source photo
Choose a sharp image with a readable horizon and visible walls, doors or street edges. Crop distracting foreground objects and leave space for characters. Use photos you have permission to use. A stronger source composition gives you a better starting point for the finished panel.
Describe what the new background should keep
Ask to preserve the main layout, doorway and window positions, and request an empty background with manga-style line work. Inspect perspective, small details and unwanted figures in the result. This is an AI transformation, not a deterministic tracing filter, so architectural details may change. Save a successful scene or use it as a comic reference.