The following keywords are used to help with the Pixel Joint search tool and to help search engines with appropriate key phrases. Make sure to take some time and add keywords to your pixel art submissions. It actually helps!
Challenge: 1BITty BITness; "Unicorn" avatars, Challenge: 1BITty BITness; "Unicorn" icons, Challenge: 1BITty BITness; "Unicorn" pixel art, Challenge: 1BITty BITness; "Unicorn" forum avatars, Challenge: 1BITty BITness; "Unicorn" AOL Buddy Icons
It just seems to need more depth. It's mainly just the ground that seems pretty plain and doesn't seem to have much depth, but that's just what I think.