To be fair--I do not know for certain that it was not part of his tradition, but if it was, it was not an important enough part of the costume for him to include it when he had his portrait taken. He's wearing everything else--robes, outrageous headdress, etc.--but no face paint. So, he might have painted his face at some point but if it had been essential, I would think he would have done so in the tintype.