There are some really nice dynamic/exaggerated poses here! My only note would be that some of these drawings seem to loose a sense of structure, mostly the ones that lack feet. Nice Work!
Sarah,Some of the drawings on the top page are magnificent. You are taking the proper approach to capturing dynamic poses. I think Don's suggestion is good - a little more development in the hands and feet would really ground these and make the hand gestures really a more finished thought. Also considering line weight variety would help, as well - but this is exactly the loose hand required to make an expressive gesture - keep it up!