Here's the first batch of drawings from Sketchbook 6, which I started back in June of 2011.
A lot of the photo reference came from The Making of the Empire Strikes Backbook by J.W. Rinzler. It's a fantastic book that goes behind the scenes of the best Star Wars movie ever, and I highly recommend it.
For whatever reason, it turns out that Irvin Kershner is incredibly fun to draw. :)