I would like to suggest a new category under Collections that pertains to books or book collecting. I would suggest something like Bibliophilic which encompasses book dealers, librarians, book collecting, authors, writers, novelists, book clubs, literature enthusiasts, teachers and avid readers. I believe that there is enough of a niche market for this genre to warrant a category. Perhaps you can poll other artists to see what they think?

May I suggest you add a "Fine Art" category?  I know you have Art and Architecture (which makes me think of existing, well-known art, as opposed to the card creator's personal art) and Illustrations (which isn't always the same as Fine Art) as well as Asian Art and Mosaic Art, etc.  I just think "Fine Art" would nail it for the kind of category I (and perhaps many others) would be using a lot!
Thanks!