looks cool, the only crit I can give is the texture is a bit overly sharp. like you went to heavy on the sharpen filter and ended up with sharp noisyness in some areas.
thanks ged! your right about the sharpness, at that time i liked the sharpen brush for adding detail, i learned otherwise now (made this one a couple of months ago). today's sketches: they where quickies (actually drawn in a car), but i thought i'd post them for some form crits :D.