Nice work, looking good. =]
Seems there's a strange vertical line with a darker/lighter region on either side, about 2/3 of the way along.
That Zbrush looks nice, just Google'd it. Also; Jim you're rich =O, that's an expensive lot of programs, $595 for Zbrush, $119 for TwistedBrush and God only knows how much for PhotoShop. =P