Well you've already got so much excellent advice here! I want to say that you've actually done so well with a lot of the trickier poses/perspectives here! Your foreshortening skills are very strong.
Something that really helped me was taking the initial tutorial here on the site, because it tells you that for the 30 second poses, you are not supposed to even try to draw the figure--just find the line of action. So you are only drawing ONE line (and maybe placing the head if you're feeling ambitious) for each 30 second segment! I had been trying to draw the whole figure, and had such an aha moment because of that. I found that staring at the pose, and trying to sum it up in one confident curve, made all the difference when it came to really capturing the gesture. Its like it laid a foundation and ran a cohesive thread through all my lines thereafter, tying the whole figure together instead of it just feeling like a splatter of random hastily drawn limbs. An important thing to remember is that while the line of action OFTEN follows along at least one limb, it doesnt need to line up with more than one or any at all. Its all in the tutorial there. As you start get the muscle memory for this line of action, you can try drawing whole figures in 30 seconds again, and you will find it so much easier. :)
As you embrace that moment of one-line zen, you'll grow your felt sense of the gesture for all future drawings. Studying anatomy is a great idea as well. The human body has a natural rhythm to it. Repeating angles and shapes. Getting more familiar with those will naturally influence your gesture drawing lines. Because any segment of the body can be expressed simply with 2 or 3 lines. So you will naturally start to make lines that resemble the real human body. Enjoy your journey!
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