I realize this is only a small amount of work and a "minor" custom, but sometimes it only takes a few touches to make a big difference. After consulting the Internet for how MCU Hulk looks as he changes, I did bright green eyes and dry-ish brushed a darker green into the left side of his face and his left hand. I used a fine point x-acto knife to do tiny pupils in the eyes. And voila-- he's on eBay and ready to be always angry on your shelf.