I think just adding some sort of official description for each category would help. I can easily see someone not understand what (I think) the "graphical" category is for -- after all, by definition any WoW UI is graphical, unless you're performing some kind of bizarre experiment in which you play with Alt-Z (hide interface) enabled.
The names could also be a bit more clear, for example:
- "General Compilations" would sound better than "generic" and clarify that it's the "default" category. It should also be moved to the top of the list. Currently it's listed at the very end of the list.
- "Artistic Compilations" would clarify that it's about artwork better than "graphical".