William Kentridge - Eraser Drawing

I was introduced to this amazing South African artist William Kentridge who uses an erase and pencil drawings to create awesome animations. They are particularly regarding the political and social issues of his country in the 1990's but even if you aren't interested in the issues the artwork are worth the look in the first place. check out this youtube clip of his work.
During our life drawing class we attempted this drawing style. Here are a few of my eraser drawings. The idea is to work from dark to light, using black and white conte and devloping tones.