I'd tone the whole thing down, go away from black black and use a mottled dark charcoal in it's place. I'd use deep, rich masculine burgundy, forest green, warm gold along with the dark charcoal and then I'd let it fly with the shield...clean bright true to image colors. Let' see If I can upload this picture which has the charcoal I'm talking about... sorry, floundering around looking for an upload image link. I"ll post pic once I find the link.