Head Detailing

I took some time to really understand pores, wrinkles and facial details. I read books such as Scott Spencer's Zbrush Advanced Character Creation, then google some image reference, I also read some online article. I really spent some time to create good finishing details rather than just over crowded my sculpting with unnecessary details.
Anyway here test render I did in Zbrush.

PONG

BPR Test Render