After discovering the great art of modern "Urban Sketchers". http://www.urbansketchers.org/
I have begun to sketch on location as much as possible. Whether it is watching my son Jacob play or during bus duty at the alternative high school I teach at. It is a great exercise and I hope to continue doing this as it really focuses all the senses while doing it , and gives a vivid reminder of the event depicted. Sketching a moving, living breathing object on location pushes you to the limits as an artist. It keeps your drawing fast and furious, with all the mistakes out in the open.