The .blend file to the head sculpting lessons in chapter 1. This also contains an additional detailed head sculpt, not shown in the videos. It's essentially the same as the smoothed head , yet with some more work put into believable muscle & fat tissue volumes and additional wrinkles & creases. I also added eyebrows and scaled down the eyes slightly.

The only method used for the detailed head that wasn't mentioned in the head sculpting lessons is using the mask brush to mask out the eye,lids and pulling down the brow area slightly so there's an overlap over the eyelids. I can very much recommend to do this to create a more believable and maybe particularly aged character.