Lich King WIP

So far I've only done the skin, using the great Brant "Ghool" Benoit's recipe for undead flesh that I tweaked slightly. So far it's mixes of Vallejo Game Color Dead Flesh, P3 Cryx Bane Base, VGC Off White with P3 Beaten Purple in the shadows and some P3 Wurm Green here and there. It's a bit flat so far, however--any suggestions as to how I can add some more depth to it?