I'm using some references in the process. The main idea is to get start on the basics, sculpting everything. Yes. I'm having a quite hard time trying to learn faces. ._.
Regarding faces, I'd just focus on recreating the Asaro planar head (google it), and understand which bony landmarks and muscle forms "create" the planes of the face. I foud this to be helpful in naming and place bony landmarks: https://www.artistsnetwork.com/art-subjects/portrait-figure/how-to-draw-bodies-lea-colie-wight/