Is it possible to edit the normal and specular maps for the eyes? And I only want to apply the new maps to a single head morph. As you can see below I have edited the diffuse map for the eyes of my head morph (I just moved the iris up several pixels) but there is a bright lining under the iris which I assume is from either the normal or spec maps:

Here's what it looks like without an eye texture (notice the iris is vertically centered again):