That looks very nice... the seams fall on natural tonal transition lines...

I am happy with one eye on the map... I can always spawn a new eye for some special effect and I don't see using this figure that way anyhow. Your three texture plan works fine for me.

Makes loading textures and making MATposes easier... esp. if one is going to do displacement and specular maps also.

Something fancy at just a little overhead cost... make the skull cap a body part with the morphs slaved to the head like the transparency eyebrows :) My preference actually would just be for the scalp area of the head to be just mapped like a skullcap.