Great job, nixonfj, those sketches say that you're on the right track. I've known, that when it comes to human proportions, you look and seem pretty intuitive with them.
However, I've got one tiner, littler suggestion: I just love how much motion and movement you've got in each and every one of your sketches, but why don't you please make more, and even more improvements with, 85 minutes of 30 second poses?
You wanna know why?? Here's the reason why: Because, it'll make your poses and lines the least stiff, and more fluid and lively in the gestures and emotions.
Good luck to you, and I hope you'll find these courteous, useful, and helpful.