Heavily drybrush with a mix of Abaddon Black and Dryad Bark .
Drybrush with Dryad Bark . Make this a little less heavy and keep the brushstrokes mostly downward in direction. This is meant to act similarly to a zenithal highlight.
Paint he fleshy parts with Bugman's Glow .
Go over the fleshy parts with some Carroburg Crimson to bring back colour. I used a drop of Lahmian Medium to thin it.
Edge highlight the skin with Gorthor Brown .
Mix your Gorthor Brown 1:1 with Kislev Flesh and selectively highlight the skin.
Add very small/specular highlights to the skin with Flayed One Flesh .
Red Carapace
Basecoat with Word Bearers Red . I made the trasition from blak easier, by putting down a quick layer of Khorne Red first.
Wash the carapace with 1 part Cygor Brown and 5 parts Contrast Medium .
Add chunky edge highlights of Tuskgor Fur to all of the plating. Also add striations on the edges of large plates with the same chunky lines.
With a 1:1 mix of Tuskgor Fur and Ushabti Bone , edge highlight it all again with fine lines. Place these fine lines withing the striations from the last stage too.
Mix in a little Wraithbone and add selective to the carapace, including the striations. You could even pop a few specular highlights of pure Wraithbone in areas that need some extra punch too.
When I was done, the carapace looked a little flat and desaturated for my tastes. So I took a drop of Contrast Medium and mixed in a touch of Blood Angels Red , applying it as a glaze to add some much needed colour.
Dark Blue Bone Claws/Weapons
Basecoat with a 1:1 mix of Abaddon Black and Stegadon Scale Green .
Glaze Stegadon Scale Green over the majority of the area, leaving the darker paint only in recesses.
With Thunderhawk Blue , add chunky highlights to all edges.
Now apply a fine highlight of Fenrisian Grey to all edges.
Selectively hihglight edges with Blue Horror .
Finish off with small amounts of white scar, on points only.
Yellow Eyes
Basecoat the eye with Averland Sunset .
Highlight a smaller area towards the front with Dorn Yellow .
Finally pick out a specular highlight with White Scar .
Teeth
Pick out each tooth with a couple of layers of Ushabti Bone .
Add a smaller layer of Wraithbone to make each tooth look more cylindrical.
Finally, add specular highlights of White Scar to the points.