Good idea! Will just add for others info, fan art is all good on user areas like Profiles, Message Walls, Blogs and here on Discussions.
Beginning categorising fan images now for others to see easier is certainly a plan but let's go for the category name being "Fan Art".
So far the wiki has "Anime Screenshots" and Images is featured prominently in other categories wording. Fan Art is, well fan made artwork and that and also keeps it distinct from article related image galleries.