Disconcerting, yet understandable: The illustrations are from historical sources. For Ancient Greek myths, many of them are by medieval and Renaissance painters. It's slightly odd seeing Oedipus in distinctly 14th century attire, or a painting of Andromeda, from Aethiopa in Africa, nude - with pale skin and strawberry blonde hair. (see also:
https://www.theroot.com/was-andromeda...)