Though I have to admit, I would love to use some of those avatars...I would never even consider using one without the artist permission, much less fill up a photobucket website where everyone has access to them!  Showing the pieces on a website that gives the artist credit is one thing, I've seen a few "Poser fan sites" in the past, but, a lot of the pics I looked at had the artist name removed from view...and that, in my opinion, is very bad form.