Sometimes a decal or text ruins a skin.
I like skins that can be used in more than one theme, such as yellowgreen lemon, which can be either used in nature, green colored theme, or halloween theme.
Make sure you test all of the skin's aspects for errors or misalign or whatever, I saw a amazing skin, but with miscolored text and some misaligns, making it look cheaply done. Who wants a amazing car that has a missing starter, and gas tube thats not connected properly, and a doors that won't close properly due to misaligns?