Basecoat with 2:1 Cadian Fleshtone and Administratum Grey .
Shade with some Reikland Fleshshade . I applied this with some precise recess shading and glazes. To make it easier, I would recommend thinning with some Lahmian Medium .
Shade deep recesses with Khorne Red , with a little Gal Vorbak Red mixed in.
Gradually mix White into the basecolour, then pick out raised details. Each time you mix in more White , highlight more selectively, until you are defining details like the point of the nose and knuckles with almost pure White .
With the skin finished,
Paint it over Light Skin Glaze: Pallid Wych Flesh & Kabalite Green 2:1 Glaze: Kabalite Green Glaze: Incubi Darkness Highlight: Pallid Wych Flesh Highlight: Pallid Wych Flesh & White 1:1
Chitin
Basecoat: Ushabti Bone & Incubi Darkness 1:1 Highlight: Ushabti Bone & Incubi Darkness 3:1 Highlight: add White to previous mix
Basecoat: Incubi Darkness Wash: Black Layer: Lupercal Green Highlight: Kabalite Green & Wraithbone 1:1 Dot Highlight: White
Coart
Basecoat: Celestra Grey & White 1:3 Glaze: Basecoat Mix & Thunderhawk Blue Blend: Basecoat Mix Highlight: Basecoat Mix & White Highlight: White