This is a good start. I can already see your progress. You captured good movement in a lot of these. Might help to draw longer lines (since you have a lot of short choppy ones) to better capture the flow of the pose, and pay attention to how each figure's weight is distributed. The later ones already look better than your earlier ones, so you're on the right track.
Hi! Great work so far!
I'd love to see you ditch the skeleton drawing you're making, right now it feels like you're just applying skin to your skeleton pose and while that does help, it might be holding you back right now. Focus more on the outside shape, but with the same logic. Big, long, flow-y strokes.
This are great! try to feel the rythm and movement in a long fluid line where all the markings are readable to convey more fluidity instead of separate parts, but again, this are really nice! keep the good work!