I cant claim the title of beeing a professional, but i gotta say thats some sweet signatures you have there.
Good work
The only constructive criticism i can think of is on the first FF signature:
(ffgirl2zz)
The text saying "KingShawn" on the left doesent really match the image. imao, you should get rid of the glow and go with something more plain. Or maybe just put some more work into the text. (it looks like you just typed "Kingshawn and slapped on some outer glow)