Your 30 minute studies look pretty good there. I'm missing some of the underlying basics that help capture the movement, which makes the second sketch look a bit stiff. I think a slight dramatization of the action line combined with more fluid lines (less short strokes) can give you a stronger basis to work from.
What goals are you currently working towards with your art?
I just want to increase the accuracy of my life drawing skills. I'm a photographer by trade. I use drawing as a means to help me find the shadow shapes in things and make compositions of them. I figure if I can make an interesting composition in a drawing I should be able to do the same with a photography.