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.
sole ancestor of the dog, which was first domesticated in the Middle East. Dogs are the wolf's closest relative (the genetic divergence between gray wolves & dogs is only as opposed to over between gray wolves, Ethiopian wolves & coyot.