Thread:Mercenary Crave/@comment-1990160-20140708181622

Learn sub-categorization of Category:Images and Category:Audio (themselves subcategories of Category:Media, but that's a super-category).

Then categorize all the things within Special:UncategorizedFiles and possibly subcategorize things directly within Category:Images.

If you need something moved, ask a mod (or maybe regular users can move files?) or apply for modship yourself. 