Sketchy Business (more cubes - open boxes)

One of my 2012 goals is to improve my drawing skills with a focus on perspective and figure drawing. I was surprised at how much interest there was in the sketches I posted, but since it's there, I thought I'd make proper blog posts about the process as I go.

You Can Draw In 30 Days by Mark Kistler (drawing practice from 2/11/12) Lesson 5 - Hollow Cubes.