That looks like you've just discovered the 'Displace' filter. Am I right?
It looks pretty good, but the filter looks a bit 'overused'. As a matter of personal preference, I only tend to use displace in small doses to add small effects. However, I could be
completely wrong in thinking that you used displace, as it could be some C4Ds that I'm seeing.
Moving on, it's a little bit hard to see and concentrate on her face, as the sig in total is a bit chaotic.
However! Kudos for the lighting
Very niceley done; you've thought about where the light source is and added a decent amount in, good job.
(I'm a bit eccentric about lighting in signatures =P)
Hope that wasn't too harsh,
JR~
P.S - use a thinner border if the border is on all sides of the sig.