I've been trying to find paintings in AC:WW. I've only ever found 1 painting, in the original game, and don't remember where. It's the only part of the Museum that I've had a lot of trouble with in both games.
I doubt that they are sold in Nooks, but I am not certain. Basically, what I am asking is, Where are paintings for the museums, and what do I need to do. Also, are the precedures the same for the DS version and the Gamecube version?