Beginner's exercises; Welcome your criticism; THX;)

I personly try more to keep the figur and the motions that it represents. Also see the figur as a part of story telling that shows what the person is doing feeling etc. Try to work in more dynamic shapes and forms to show the motions that the model is in.

You've done a good job at capturing the basic gesture of the model. With gesture drawings, you don't have to worry so much about proportions, for that you need to spend longer amounts of time on the drawing. If you havn't already, I'd recommend Micheal Hamptons "Figure Drawing:Design and invention".