There are a lot of good things in your sigs, but also bad.
If you work on these things, you might become RayMuchSigsMaster.
-Try to not leave some pixels around the character, that really is the one that bothers the most...
-Try to make the names not paste over the head or body of a character. The one of skater: Now you don't see his head anymore. It's like a photo with your name on it, and your name is over your head, can you imagine?
-Try to make a line or something, around the pic. So that there is another color around the pic, that should do as edge. (Gigaman's small sig) It looks better, really.
-Try to not paste a pic just next to another, like in the 3rd pic. Now the rayman is too far away, and it jumps just to the black of murphy's pic. I think you should take a murphy pic with a white bkg.

-Finally, add some cool effects to your pics, like a sunray or something. (Check gigaman's big sig, a bit in the rightunder corner

)
But if there are negative things, there are positive things too:
-I think you did a great job at first. Especially for a amateur.
(I can know it, i started alot more negative then you

)
-You did cool objects in the corners of the pics sometimes, that's really cool!
-You did nice shading, with the Henchman pic, it is really a nice shading.
-Also cool 3D letters, you made it look better by that, really!
-You also did nice fonts, i never used these, they made me stare more then five minutes to them!
I hope you can do something with this, and i hope that i helped a bit.
I'd like to see more of your sigs!
