I'd search the forums but alas I cannot. Years ago, back in my msquid (or msquid, long arms of the law etc.. so should have used that) days I suggested this also.
A forum for art, while acceptable, is inefficient. We need to have an area developed to have more of a gallery feel, somewhat like dA, but a lot simpler - just one main post that is seen on every page and comments underneath you can to reply to, rather than a running thread. Add some java mebbe, instead of showing flat, show a mapped rotatable texture.
Maybe have an artist license given to upload and trade textures, otherwise you can only upload your personal flats. Admins can run queries to see everything uploaded in past x time to review all uploads (I wanted that so badly.. plagiarism resulting in a ban withing a week tops and, knowing the admins, they wouldn't miss a thing)
Player shops could incorporate textures with #tags for easy searching and add a few admin spots to give a rating X/10 for quality.
I personally feel that this forum is inadequate for the art community, especially if the greenlight succeeds.