From my Freshman Year, these were in-Class studies of Portraiture using different techniques, drawn off of a live subject.
Probably my favorite of our four techniques, this is a pencil study of Cross-Contour line drawing. Lines are drawn "parallel", but curving along the surface of the form. If that's confusing (since it was to me), just look at the faces printed on dollar bills, and you'll see this technique. The corner image was a short 20? minute sketch just to practice the technique.