Scene was rendered with mental ray, there was 3 MR area lights, one from front, the other two helping from back. I used final gather without GI and rendered too many elements for compositon in Photoshop.
Post - Production
In photoshop I did some color corrections and mainly tweak the hairs little more, cos it was just a quick way to draw some problematic areas over.
Hope you like this small overview of the method I follow to create this image, if you have any doubts or questions then don’t hesitate to ask and send me an email.