The Artwork forum has a new sub-forum named Art Shops.

This is for selling your artwork at a flat sale price.

Art Auctions still belong in the parent Artwork forum.

This should help you better find what you're looking for.

As always, you may only buy/sell art for Game Currency.

Edit: I've now added an Art Requests sub-forum as well. These new sub-forums should help organize things much better.