I have been working on this portrait for past few months, for the model
i have just used one of my old heads,and changed few things.base
textures were painted in zbrush 3.1 with the help of projection master
and polypainting,later on i used lot of maxon's bodypaint and photoshop
to paint some more details on the textures,so it was back and forth
process between zbrush 3.1 and bodypaint for all texture
maps.displacement and bump maps were extracted from zbrush 3.1.
For rendering I am using Mentalray with imagebased lighting .I am using
MISSS Fast skin shader for the characters skin and Eyes.Eyebrows were
made in maya painteffects .
For the modeling base mesh in Maya, Mudbox and Zbrush for all sculpting
and detailing.Finally the image was composited in Photoshop.