>>7736553Paint the eye sockets black. You can use a wash, or acrylic, or enamel paints. Seal with matte clearcoat. Get a pack of polymer clay, like Sculpey, in bright red. Make two tiny little balls. Bake it. Place in skelly eye socket, and glue in place with epoxy. After it dries, paint the red eyeball with a gloss clearcoat.
A physical eyeball will always look way better than a painted-on one. It'll be perfectly round, and easier to do without screwing up.