Sketchbook - Pilot whale skull. 2013.

Edit: A friend of mine and I recently had this really neat discussion about odontocetes (toothed whales), and the fact that their skulls, unlike the vast majority of vertebrates, are asymmetrical. If you look closely at the skull, the opening for the blowhole and the rostrum seem to angle off to the left as they approach the cranium. This has to do with achieving the greatest spatial and directional accuracy while echolocating, a trait exclusive to odontocetes.