I haven't really given that any thought. Yeah, I suppose some sort of credit would make sense (in case anyone likes the artwork so much they want to see more, haha). Perhaps the URL of the artwork on dA? That's probably more useful than "Artwork by Lyra/Qitian" (who the hell is that anyway? ;)).
But if you've already a standard credit line for other artists, I'm willing to adapt to that!

Got the link; now I just have to wait for ideas!