fls13, The Head Room looks alot like "Morph" - a morphing software that dissappeared about 5 years ago. I still have it. It was very good ad morphing from one image to another - with a little care. It was used very effectively in a Micheal Jackson video. I'd guess that they've set up some kind of presets/templates that match the models heads. You'd define specified areas on the actual face photo and the software morphs it to match the template/preset. Then it could be applied predicatably.

Before they made me they broke the mold!
http://home.roadrunner.com/~kflach/