Hi!
I think your gesture drawing shows promise. I like the focus on the line of action, but it seems your're having trouble having the form of the body flow along with it.
The human body tends to flow together. Parts will stretch and pinch. Skeletal muscles flow along the bones as well. As you're drawing, think about how everything flows together in one continuous motion. While there's the main line-of-action, personally i found it helpful to imagine multiple lines, sort of like hairs, all flowing together to create an accurate abstraction of the pose.
Hopefully this helps!
