Use Black Templar to paint the carapace, talons & body armour sections.
Use Ultramarine Blue to paint the armour of the model.
Use Magos Purple to paint the outer fleshy parts of the model.
Use Darkoath Flesh for the mouth and fleshy areas of the model.
Second Stage:
Use Druchii Violet to paint the carapace, talons & body armour sections.
Use a 1:1 combination of Lahmian Medium & Leviadon Blue to paint the armour of the model.
Use Druchii Violet to paint the outer fleshy parts of the model.
Use Carroburg Crimson for the mouth and fleshy areas of the model.
Final Touches
Illuminating Blue Brain - :touch up area with Wraithbone and then use Briar Queen Chill to add the blue illumination with Poxwalker into the crevices to add depth.
Eyes - rebase with Wraithbone and then use Briar Queen Chill with a light application of Poxwalker into the crevices.
Teeth - rebase with Screaming Skull and then use Agrax Earthshade to add depth.
Dry brush for highlighting the carapace with Dawnstone
Dry brush the outer fleshy areas with Slaanesh Grey