It looks a bit flat and doesn't really seem to have depth. The font of the text is also a bit hard to read at first.
Wow, I think this would have looked a lot better in color, but the effects are amazing. The text is perfect for this sig, although the lighting could be worked on a bit.
That doesn't change the fact that color can still be used to make this look better... Plus a nice gradient map or warming filter could really help this.
