Here's Humphrey Bogart.
I really like drawing with ballpoint, but the problem is you can't erase. After I was too far along, I realized I made a mistake having the bottom of the nose, and the far cheek bone jut out at almost exactly the same angle. Also I wish I had handled the shading on the other cheekbone differently in order to match the structure of the far cheek bone. It's easy to exagerate things that have outlines, but much harder (yet just as important) to exagerate things that are only defined by shading.