Keyshot render
Sketchfab version
Keyshot render
This is the process I used for sculpting the skull. I learned this approach from Kris Costa during an online course.
This is the refs collection I used. Images from boneclones.com, medical websites, and one digital skull from an artist that I unfortunately can't find anymore and would like to credit for the image here.
Zbrush shots
Human skull for study and reference. Available for purchase and download to study and for print. Some anatomical liberties were taken for printability and simplification. https://www.cgtrader.com/3d-print-models/art/sculptures/artist-sculpted-skull-reference