I started absolutely clueless for a color scheme. He is supposed to be "Satanic" so the obvious would be reds, browns and maybe black wings (If I find another I might try that I suppose) but I think he would get lost among all the bat winged demons.
He has a squished broad face beneath high domed forehead and though full of character it is hard to take this figure seriously. I can only assume that the sculptor was inspired (knowingly or not) by Eagle comics Mekon - Dan Dare's nemesis. And I'm sure if i had picked green the likeness would be striking.
But then the Mekon doesn't have wings - he is an early proponent of the flying disc (Eat your heart out green goblin)
(Mekon: 1950, Green Goblin: 1965, I looked them up)
Blue was another color I considered - but...
My Mum suggested gold for Servants of the Gods - and in the end I went with that general idea: