An illustrated character will not look like the same passport photograph repeated on every page. Camera angle, lighting, distance and expression naturally vary as the story moves. The goal is that the reader still recognises one coherent person through those changes.
Identity continuity comes from relationships between features—face shape, eyes, brows, nose, mouth, jaw, cheeks, skin tone, hairline and hair texture—along with age, build and distinguishing traits. It should not depend on pasting photographic skin, eyes or teeth into painted artwork.
