Thanks to you both. You confirmed my thoughts Bailey that painting the demon head contributed to the mask's appearance. Nonetheless, I may still paint it NMM gray green. Like the axe on Goliath, if you remember. Haven't decided yet. Metal will be a dark red with gold trim.
I just might test out some Alazarin Crimson oil paint over a red base. The hope being that this strengthens the red pigmentation, making the standard red appear lighter, thereby making it unnecessary to use flesh or orange or any other method for my highlights. Sounds good in theory anyway...