Please excuse the crude drawing. Most of this is just figure study and concept review. I really used to know my shit as far as art goes, but that was a long time ago. I've let myself go for a long time and I'm trying to keep myself from forgetting what I've learned. I figured some of this knowledge might benefit others, so I'm uploading my studies. :)

Top - Figure study. Attempting to emphasize motion through line.

Left - How to draw in basic perspective.

Bottom center - How to draw ellipses in perspective.

Bottom right - How to draw figures in perspective. (box method)

Also threw in a quickie demonstrating how to use core shadow to show ambient lighting and thickness of line to emphasize shape.