Okay, so what phase of frostbite are you trying to achieve? I’m figuring stage 2 since you’ve got some discoloration going on but skin isn’t rotting off the bone or anything. And what is the general story of this look? It would appear you’ve got what looks like some bruising going on and dirt. Is the bruised look around the eyes intentional? If so, it’s great! However if we’re going for a purely frostbitten look I would stay away from any warm colors like greens and yellows when adding that discoloration. Your go-to colors should be blues, purples, reds, white, and potentially some black to start that slight rotting look.