Hey guys. I found this site, 3dm3.com, that has a ton of really in depth maya tutorials. One in particular that caught my eye was this one about high polygon realistic character creation. You may or may not know that for Star Wars Episode III: Revenge of the Sith, Grand Moff Tarkin (the non-Darth Vader bad guy from episode IV) appears for a brief moment to over see the construction of the death star. Because Peter Cushing, the actor who portrayed Tarkin, had since passed away, they created an entirely CG version of him for Ep III.
The specific tutorial I've linked to, shows exactly how they did that (at least for the sculpting of the character). I chose this particular tutorial because it's just like what we're doing right now except TIMES A BILLION. Check it out, and feel your blood pressure raise at the sight of all those edge loops.