!Artshare is a decent, general purpose art-centric community. People submit their personal art work, and the skill level seems to have a pretty broad range, which I like.
Others, like !traditional_art, !Digitalart, etc. seem to have a high bar when it comes to submitting art, so I think that those types of communities tend to center more on sharing/posting others’ artwork (i.e., professional/advanced artists, etc.)
There are other ones like !drawing and !learntodraw where the focus isn’t so much on quality/finished artwork, but the community seems dead.