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& likeness, you need to understand what lies beneath their skin.
This unique design features the flag of The United States painted on an aggressive skull. The American colours cover the entire skull with large cracks snaking across the bone. This dark pattern is a unique way to show off your patriotism.