Modeling a human head
You can buy this model with paypal, click this for more imformation.
My recent work. 
Intro:
In about 2006, I know that this kind of method (From a cger named ChenDaGang) to accomplish such a model, I spent a lot of the time but I did not achieve the desired effect (Curve adjustment, surface creation,etc.) , that made it impossible for me to go on.
Two weeks ago, I have time enough to do the work, Now I know that sort of work wants a lot of patience. And I am still working on it.
Chief method:
Draw the section curves, and then use loft to create the initial surface.[You can see the post modeling a human ear (by rubencito)]
Modeling a human ear-rubencito
Quotes:
I first sculpted an ear from a modeling clay, sliced it like a birthday cake and visually “digitized” the sections into Rhino. I used Curve->Freeform->Control Points to draw the section curves. All sections must have the same number of points and the points of all curves must be visually in sync with each other. I rotated the sections in place and used Loft with Closed Smooth option to create the initial ear surface. Rubencito