This video shows how to paint the leather armour on the Ogroid Myrmidon plus some of the highlighting on the black skin.
The following paints were used:
Games Workshop: Rhinox Hide, Mournfang Brown, Cadian Fleshtone, Morghast Bone, Abaddon Black, Wild Rider Red, Fire Dragon Bright
Vallejo: Pale Grey Blue, Neutral Grey, Dark Grey, Black