I do this often. Tape off the head so that over spray won't get on the feather area. Spray the painted head with a matte polyurethane, wait about 30 minutes and spray it again. Let it dry for about 2 days, then take an old used scotchbrite pad and lightly buff the sprayed surface to make any shininess even flatter. If you want to, take some clear or black glossy enamel (fingernail polish) and carefully go over the eyes so that they look wet. This should get you going.