There is a lot of different gallerys in Second life. Very big ones with many paintings and some good art. And the small ones often run by the artist with a few pictures or sculptures.
In the big ones you get a big dose of all the culture you could want.
But I rally prefer walking around in a city block finding small gallerys and designers or maybe a strange store or two.
Just visited and then moved away again
Why are the chairs there?
Found this gallery close to mine. Nice pictures from Second life.