Here's a new head I made recently to explain characters pipelines combining Zbrush and Maya.
The high res sculpting, texturing (in polypainting) and matcap rendering is done in Zbrush.
Here's a turnaround render:
This face has been done with a small utility I made: maya character creator.
It's a simple scene that allows you quickly create face variation in maya, like in poser.
I did it a long time ago so the topology is not perfect (and its in french) but I received many mails asking where to get it so I decided to gave it as free download:
Just open the scene in Maya, select camera01 (you can unlock it if you want to change its position according your screen size).
You can click and drag pannels, use sliders, move joysticks (select the circles) to change the characters position, change the subdivision level etc...