Art requests.
 

Just saying, we should have an art request forums, where people can post their requests or OC/avi lists.

I like this Idea.
That or a thread that is all for art trades.

what a good idea, it keeps buyers and artists easily in hand, and reduces hunting too

we should have an Breedable/Changing Pets forums

There's a forum for buying and selling. It's fine how it is, IMO.
Though I do think it might be nice to see a Breedable Pet subforum in there.

Oh, and we should also have an art discussion forum. All we have right now art galleries and shops, no real forum.

I can't really see why that couldn't be done in the borough, but hn...

It might seem easier for the user requesting art, but it wouldn't be. If I know forums, I know that the request board replies would be 75% people with skills that don't match the user's requirements (but the artists think they do), price offers that are too high for the user to pay, and people who lack any experience in selling art taking on jobs they can't handle.

The current system of artists selling and buyers going to them is actually fine as-is.

EDIT:

I do agree that there should be an art discussion forum (talking about techniques, materials, recent accomplishments, etc.) outside of the Borough, though. The Artists' Borough - whether it was meant to be this way or not - is not a discussion forum, it's a gallery. People show their recently finished works and portfolios, but it's not (currently) set up as a place where users can discuss art as a hobby.