In my figure drawing classes my teacher talks about getting the line of action down and a basic description of what the figure is doing. Then he describes the figure in terms of simple volumes like eggs and cylinders and that the anatomy and details should reinforce the larger ideas. I really like the look of drawings with simple solid construction and would like to get better at it.
I stumbled on John Kricfalusi's $100,000 animation course a little while ago and it uses the same ideas to draw cartoons. I'm hoping that practicing with the simpler stuff will help when dealing with the more complex things.
These are from Preston Blair book.