If you can see through models when load texture, then check out this tutorials. Hope this helps.
In case you dont know about it, AdvancedSkeleton has a completely new FACIAL SETUP.
Using joint based setup so it’s much easier to transfer the rig into game engine now. Feel free to check out the free rigs here:
About Advanced Skeleton:
Advanced Skeleton is a FREE Maya rigging plugin:
“Advanced Skeleton can create rigs with unlimited body configurations, 3 heads, 5 legs, 100 fingers, & anything goes. Not only creatures, but you can also rig props, vehicles, and just about anything. You can at any time go from Advanced Skeleton, back to the Fit Skeleton, make changes, and rebuild.”
Check out more information here: http://www.animationstudios.com.au/advanced-skeleton
Please use this tool, at 9’30s.
Download Advanced Skeleton: animationstudios.com.au