This series of tree drawings were from a drawing class assignment last semester. Each one is 4" x 6" and were drawn using only a black ball point pen. No pencil lines were drawn first so no going back. It's amazing how much variety of value and what depth you can get with an ordinary black ball point pen. I really learned a lot from these drawings and plan on doing more. These were all done from photos. Some of which I took myself. I found that making a black and white xerox of the images help me see the contrast. Layering marks on top of marks, I could achieve the depth and texture I was trying to capture.