Advice to improve gesture drawings

Hey everyone, first post here, a little nervous but I knew it was time to get some critique!

Recently I’ve been trying to improve my gesture/figure drawings, and I aim to draw from reference for 30 minutes several times a week. But for a while I've felt like I'm stuck in a plateau and I'm not really sure what to do to improve. I feel like my sketches are lacking something but I can't exactly pinpoint what it is. I’m open to any advice or critique :)

Here's some of my 5 minute gestures (with a few 30s-1m ones thrown in there as well) 
https://imgur.com/a/vjlCxDG

These are fantastic. I can only compare them to my own work and the same reference I have used. I don't really know enough to offer advice on how to escape a plateau - however, I do want to just encourage you to keep working at it.

These are excellent, you have absolutely captured the form and essences of the references. Just keep working at it, the hours stack.