Abraham Lincoln drawn using the rules of 2 point perspective

Despite spending the past 2 days drawing (with brief breaks to watch Breaking Bad and visit the gym) all i felt like doing this evening was continue to practice drawing heads. As I drew this picture of Abraham Lincoln I concentrated on the angles of the face using 2 point perspective to make so that the face did not look flat. I've learnt that the trick is to think of the face in terms of planes (like modelling in maya); I think of the side and the front as the 2 visible plains scaled using 2 point perspective, the nose and lips are then separate planes which also need to adhere to the lines of the perspective, the rest is just detail and shading.