3DTotal.com features a face modeling tutorial by Oskar Swierad and Kamil Makowski. Their workflow incorporates Blender, ZBrush and Photoshop.
Even though the Blender part is relatively thin, I think it's interesting to see that they selected Blender for the head modeling and UV unwrapping. They even comment 'In Blender it can be done very simply and fast', which is quite a compliment!
If you want to try ZBrush, you can get a free trial version. Unfortunately, it's crippled so that you cannot import models (among other things), which is required for this tutorial :-/