Actually Xurge uses a math node with his displacement maps. You must do that in Poser to ensure that medium gray (128,128,128) is the color that do nothing..but perhaps you had something other in mind? He also use a elaborate metall shader which I can not see in the picture above.

But regardless of technical deficits, he is ranked #1 by many, certainly by me. That is a reminder that it is the art that is the most important component. The name is CG "art".