If we are talking early early then it was because art wasn't a form of "art" it was a form of communication.
But a little later down the road, people did not understand the human body and could not paint one perfectly, and also painters loved to show perfection, as in, gold everywhere, or a kind a top a thousand bodies. Something like that. So yeah...
C. Neon color
Because the colors are higher in hue and saturation and is depicted as “childish”
Aaron Copland, hope this helps :)
I believe your answer in terms of music would be ‘One Beat’ (: