you bumped in 15min...? wow... anyway back to the sig, it looks nice, love the splash effect, but the background is plain...
Very clean, very subtle coloring with the lighting is a nice touch. The lighting up top kind of messes with the render, if you look at the places his eyes and the logo on his chest are shaded...there should be no light to the top/left side of him, the bottom light source is placed perfectly though.It seems to be a simple tag, but in this case...less is more. Very nice work, everything compliments everything else so well.
v2 is much better. I love the "plain" background. I think it works well with the image as a whole. Kudos to you.