Sculpture community, photo community, painting community, artist community, art school community, you get the idea.
Check out the ljuser_art userinfo and post an entry - we're hoping to get a list going so that people can check by and find the right art community for them.
It'll only take a second and it's making life a little easier for people 1) without paid accounts, 2) faced with the dilemma of "which art community should I join?" and 3) the people at communitysearch (which is where I hope the list will go).
I know there are a lot of art communities out there.. chances are you're in one. What does it take? Only two seconds to post the name of the community and a one-line description.