3 skills
A House Style That Holds Across a Batch
Vary everything in the reference set except the look, or you teach it a subject and a pose instead of a style.
Steering the Live Canvas, Not Chasing It
Change the sketch or the prompt, never both, and save the frame the moment it is right. There is no way back.
Upscaling That Does Not Rewrite the Picture
Enhancement invents plausible detail where the real detail is missing. The four places that turns into a forgery.