awesome head! but about the eyes, maybe you could let the white "nose" look like it overlaps the eyes a little as it's put in the front. now the eys overlap the nose and that doesn't work. and I think shading the grey part around the eyes a little works too.
I think that the angular parts of the ears don't fit as the head is rounded. so maybe you could round those parts a little. I don't think the head needs much detail if you want to keep the style the head currently has, but that's just me.
but I can't tell you how much it costs, as I have no experience in texture trading