Generating one illustration of a child from a reference photo is easy now. Generating twenty-four of them — same child, same style, different scenes, no drift — is where it gets hard.
Drift is cumulative and sneaky
Generate each page independently and every one is individually plausible. Put them in sequence and the child ages three years between page 4 and page 11, the hair changes length, the nose shape wanders.
Nobody notices a single page. Everyone notices the book. Picture books are consumed as a sequence, so consistency errors compound in a way single-image metrics never capture.
Identity and style are separate problems
