First 5/10, second 7/10. First doesn't look appealing and second would look better with the face as focal point instead of a stomach.
7.5/10 Bit too monotoned for my liking and the BG is lacking some depth. Though the render is blended in quite nicely. The text needs some improvement too imo..
Those 2 look ripped - they both have different names and both arent yours. I'm not even going to rate them.
Syko. 5/10 I really don't like this as a signature, it doesn't flow well at all, the colors are to random, and it's way to big for a signature.