Nicest job, mgart, on your 5 minute drawings. And, here's my critique: You ready? If you did another 2 more 2 minute sketches, flipped horizontally, and vertically, at the same time, you'll get a much, more than better grasp and understanding of your overall proportions. (If that's what you're going for) Hope you'll find it totally essential in your next study.
Polyvios Animations
Because, you'll draw the image as if it's flipped at 180º, so that you'll tap into your right hemisphere, all right?
Hope you'll find it an extreme asset,
Polyvios Animations