Basecoat with a mix of 2 parts Cadian Fleshtone , 1 part Screaming Skull and 1 part White .
Mix some of the base colour 2:1 with Doombull Brown , then add some general shading to the skin. I would recommend keeping it thin, using some Lahmian Medium , to keep things smooth.
Increase the amount of Doombull Brown so it is now roughly 1:2, then shade more selectively within the previous stage.
With pure Doombull Brown add some final shading,. I would recommend only shading where elements need separating. For example, between fingers, seperating limbs and the eye sockets.
Basecoat: Cadian Fleshtone, White & Screaming Skull 2:1:1 Shade: Doombull Brown Highlight: Basecoat mix & White
Black Hair
Basecoat: Black Highlight: Kantor Blue and Black 1:1 Highlight: Thousand Sons Blue & Sybarite 2:1 Highlight: Fenrisian Grey