Hi, sorry I can't really help you because I'm in the exact same situation as you are, getting back into drawing and all. All I can do is encourage you and say that, even though I don't know a lot, I like tour work. Keep it up !

What you want to do in a gesture drawing is look for an "S" or "C" curve that will describe the whole pose from top to bottom. Also look for rhythms in the limbs that connect with the overall gesture lines of the body. Try to avoid using any anatomy and focus just on the gesture. I took one of your drawings and did a quick sketch to show you what I mean.