Life Drawing: thumbnail sketches

Here are some quick sketches from life drawing class. To give you an idea of size, each drawing would fit comfortably on a regular sized post-it note:



As you can see I drew the same pose several times, starting a new sketch every 30 seconds:



I find this method often helps me understand the basic shapes of the pose I'm looking at. Here's the last sketch from this little drawing session, which altogether lasted around 5 mins: