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In this picture you can see reasonably well how closely adherent the dura is to both the brain and the skull (you can see how close it is to the skull near the bottom of the picture).

As an artist - especially a portrait artist - you have to become very familiar with the human skull. It is the foundation of the face. If you are ever going to accurately capture someone's likeness, you need to understand what lies beneath their skin.

Antique dental training head, c1930. made of aluminium with steel gums and real human teeth.