Hm...I don't really like the clipping masks, i think they should be removed... And I don't really like the colors to much, maybe black and white? Also, the guy in the middle is a big no-no, he should be taken out... Try removing the text as well. In fact...save it as png and go ctrl>a then alt>backspace with a...kinda white color. I think the sig would look AWESOME...=D
You call that B&W? LOLOLOL I like it. Very good use of clipping. :D My only problems are the floating head. Identify his vaguely noticeable body more. Also, fix your light source. It's entirely unrealistic to an actual light source. I can see right through it. Try moving it up a bit. :/