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Not really, if the moderators are smart and set the filters based on rating.

Not to mention, what about artists who wish to remain anonymous?

Conversely, I'd also suggest that the commissioner could post the image,and tag artists with the "artist" title so that the artist could add that to their gallery. I know a couple of artists who are really lazy to post work they've completed and they would benefit from this.

but the question also goes to this: what if the artist does a complete wipe of their gallery? I've seen time and time again artists who didn't like their work and would delete a commission, only for the commissioner to never see the image again should they lose the file for some reason.

I know, old post is old, but actually, the artist has rights to the labor. Commissions are a shared ownership. and the character IP belongs to the commissioner(s).