Hey there, those are nice drawings, I noticed you've got a handle on the big forms and the relationship between the torso and pelvis, that's really good. Like Polyvios and Ollie said, you just need to loosen up a bit and use less lines. Try to make your lines longer/cleaner, you don't need to draw every line or form you see on the figure to make a good gesture drawing. Group the torso and pelvis even further with a long flowing line when you can, but keep that relationship of counter-balance between them.
For the arms and legs, use 2 or 3 simple curvy lines that kind of imitate the muscle curvature to capture the movement and grace of the limbs. It's good to add some cross contour lines occasionally to solidify your understanding of the form, especially when drawing anything that's foreshortened.
Also when doing longer poses, draw all the shadows you see on the figure by grouping them into large simple shapes and then shade them using one value to give the figure more form.
So basically, with gesture drawing, try to describe more of the movement that you see, even more than the figure itself. Try to "feel" the movement and direction of a pose. Draw from your shoulder when you can, and relax your arm muscles. Hope this helps, I'm still just learning a lot myself, but I've found these techniques useful, have fun! =)
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