Basecoat with 2:1 Cadian Fleshtone and Mournfang Brown .
Increase the amount of Mournfang Brown in the above mix and shade the skin.
Mix the base colour 2:1 with Ushabti Bone and add chunky highlights.
Increase the amount of Ushabti Bone in the above mix, so it is about 1:2 now. use this for finer highlights.
Mix in a little White and selectively highlight.
Increase the amount of White in the mix, until it is a subtle off-white. Now pick out a few specular highlights.
When it came to the shaved portion in the centre of his head, I highlighted as normal, then mixed a little Dawnstone into the initial highlight colour. With this mix, glaze the section then highlight if needed. This should add a subtle grey.