Pronghorn skull from the Burke Museum, Mammalogy Collection, University of Washington, Seattle. Colored pencil on watercolor paper, cleaned up in Photoshop.
(Antilocapra american, family Antilocapridae)
I wanted to capture the roughness of the sheaths on the horns versus the smoothness of the ivory skull. (Pronghorns shed their sheaths annually, but underneath is a horn made of bone.)