Did you pay the artist for the image? It does matter what the agreement was; but the most common is that you own the image, but the artist can publish it in their gallery to show what the art they produce looks like. – If you’re unsure, ask the artist.
@Background Pony #BC68
Right now it’s going to be the hills outside Canterlot again, but with 20% more winter. However it may change depending on quantity of OCs, as the hills can only fit so many ponies.
That being said, you can’t really request specific spots. You can request to be located next to specific ponies, but otherwise everyone is going to go where they fit best.