Old Man Sculpt (WIP)

I decided to sculpt an old male face. This sculpt is a part of the learning process for me to get better at sculpting. The old face is a complex form with skin folds and lots of wrinkles, so it is a good challenge for someone like me who is fairly new to sculpting.
This sculpt was done using mudbox. It is only the first pass and has about 1.5 hours of work in it.