I've also done some head swaps with the Orc regiment box and I also have some of the old, old Drastic Plastic Orcs and I've swapped in one of those heads as well.
The two main clothing colors are Vallejo Game Color Cold Grey and the old GW Bubonic Brown. As per usual, the non-skin areas were highlighted up with Bleached Bone. After everything was painted, the model was given a wash of 2-1 Devlan Mud, Badab Black.
Skin: Knarloc Green, Elf Flesh highlights
Skin: Camo Green, Bad Moon Yellow highlights.
Skin: Coat d'Arms Goblin Green, Bleached Bone highlights
Skin: Catachan Green, Elf Flesh highlights
Skin: Goblin Green, Bad Moon Yellow highlights