Try rendering from a differnt angle or lighting to see if those white artifacts appear. to me they look as if they are part of the texture because I can see a few white artifacts under her eyes as well. Also go to the render options and activate antialiasing to get reid of the jagged edges on the eyebrows and hair. As for other tweaks you might want to set the nostril color to dark just so her nostril don't glow and maybe pose the eyes a litte, experiment with what looks best to you. It's looking good I like the character very much :)