This is a creation originally targeted as a training for a sculpting from a simple plane.
The depth of field has been created in Photoshop with the help of the Z buffer generated by the ZRGBAGraber from ZBrush.
Render done in ZBrush, with some matcaps found on the ZBC matcap repository.

For the subject, I wanted to created this kind of surface put on a face and give a print effect.