I would color Iorgesen with a deep forest green, and make his horns, wings, and spikes lighter shades of green. His eyes could be a bright yellow, and his claws and teeth a deep maroon. The lining of his wings could be a dark brown and his scales a lighter tan. For a bit of contrast, I would make the underside of his wings and neck a pale shimmery silver. He looks full of strength and power, so I would add a few touches of golden orange to bring out the energy and daring. Overall, I imagine a majestic creature, bright and bold like the colors of a real dragon.