Seeking Critique on Gestures

Hi, just wanting to get some critiques from the community about my gesture drawings. I know proportions are slightly off but I'm slowly getting there, I'm hoping to hammer that out with consistent practice. Please give me any critiques you may find important so that I may improve! 

I've done 15 poses within the timespan of 2 minutes for each pose.

https://imgur.com/a/SAELpnS

I think you are on a good path towards an understanding of gesture. You could try to "upgrade" the primitives you use to indicate the masses with forms like they are used in this clip: &list=WL&index=99
that way you gain even more clarity and structure for your foundations.

Independently of that, I would also spend some time daily to train your line quality, just 5 to 10 minutes in warm-up to draw long, clean and precise lines, and smooth curves. That does not come automatically from training gesture, but it really ups the result. You can have perfect grasp on gesture and scritchy, scratchy lines, and the result will be carried by your good gesture and still look ok, but if you also has clean and determined line, it will start to look really stunning and get that pro vibe.

depending on the time you've been practicing drawing there is not much to improve at this point.

proportions are overall right. the poses feel quite dynamic. your lines seem confident. 

keep practicing like this. revisit the basic now and then. and try to stay relaxed.