Like our Street View Paint OFF, the Original Virtual Paint Out site has a challenge location each month and he has a lot of fabulous artists participating. It's not a contest really, no voting, no prizes, but fabulous art. They have a Facebook page and he does share the paintings there as well as on the blog. I wish he'd share the Street View that originated the paintings, but then I know how much work that is.
If you like our contest, I highly suggest you check his out. His sight is widely read and covered. If you have a website or blog where you market your art, you could gain some valuable exposure there.
Check out Bill's Paint Out and his original 50 State Series, also done via Google's Street View. Some great inspiration there.