I used Mental Ray's, "misss_fast_skin shader", in order to get the subsurface scattering effect of real skin.
I created all the maps in ZBrush through the use of poly-paint, no texture sampling was used whatsoever. I am posting all of them except for the Displacement Map (there's no point in displaying a 32 bit map file in an 8 bit environment such as this one).
The bust was modeled in Maya
Sculpted, painted, and textured in ZBrush.
Lit and rendered in Maya/Mental Ray.
Composited in AfterEffects.