I don't have anything to do with the skin database, I was just giving you my 2 cents, contact a member of the skin team.
clefairy' louis Ravie
They'll tell you what's wrong with it / accept them if they're high quality enough.(edited)
It makes the client load up slower the more skins you have in your game folder, so it's better for them to be in a database and loaded when needed
Use #questions for future questions, please. (edited)