This is current work in progress on personal work (original design). Hope you find this helpful. I'm finding using nurbs modeling in Maya and the power of ZBrush's dynamesh, zremesher, and uvmaster tools are really helpful for modeling workflow. I still need to work on the eye lids, eyes, brows, nose, inner mouth, face expressions.
Inspired by Josh Robinson's online tutorial on UV'ing in ZBrush (joshrobinson3d dot blogspot dot com)