The word "mythic" refers to things or stories that are related to myths or ancient legends. It means something that is not real or based on reality, but rather based on ancient tales and beliefs. Full definition
You could say that those paintings are a kind of mythic image of the painter. (art21.org)
The «upper world» included celestial bodies and weather forces personified in mythic characters that exerted influences on the human situation. (sciencedaily.com)
The use of mythic figures to distinguish individual societies has continued, though many of the figures have long since lost any social or religious power. (religion-online.org)