I have never drawn for so many hours in my life than I have at Dr. Sketchy's marathon. It was 26 hours straight and was really intense. Thanks goes out to Bob and the rest of the people who make Dr. Sketchy's possible.
Here are some samples from the marathon. I even brought in my Cintiq to use at the end. Regretted not bringing it in sooner but it isn't exactly portable and I am still a little shy about my digital painting.