The skin on the goblin bust is painted this exact way as the deathguard armor I've been working on. You can see the bust above starting to I the sift as I won't go really dark until the next stage and again that darkest color is applied like a glaze over and over,making sure the previous is dry not to over work the area, before applying the next layers of shades which will be 1:1:1 of calo black ( p3) agrax earthshade , and leviathan purple laid into the eyes the lines in the face and the underneath horizontal parts where light dont reach. Stay tuned.