For the spec map I just used what i've already painted i've just by adding a Hue/Saturation layer to fade out all the colours.
Notice i've use most of the layers but left out some of the colour ones.
Next is the reflection map, this is kind of like a spec map is it brings nice colorful highlights in the more reflective parts of the skin. notice the eyelid and lips are the brightest parts to give them a nice reflective shine. this map does not really have that much effect in this shader.
This map is very similar to the spec i've just added a few more layers, I used a Colour Balance Layer for the purple tone and painted a few more colour layers on top.
This is my diffuse map, not really to much to say on this, just trying to keep certain spots and marks nice and dark.
Well here's the translucence map trying trying fake a little sub surface scattering and get some redness around the ears and a little around the nose.
This map is turned down and made darker in maya, noticed i've over laid all the spot and bump detail keep them nice and dark.
Well i guess that's it, I hope you found my little texturing tut usefull.
One final tip (see below) images can always be tweaked and improved if your not happy with them.
That's it, byeeeeeeeeee!
More 3D Graphics: 
