I can't quite see the December ones, but what I can see is that the flow of the pose is very well captured in your drawings, which is generally the point of gesture! I can see very well how the body is positioned and where it's pointed, which is nice. These also look to be very quick, and it's always good to build up the ability to draw fast and precisely.
One thing I would attempt is to give yourself a bit more time (or don't) and try to add some detail, like the general shape of a limb or feature, and to push those shapes as much as possible. That way you retain the flow-y nature of your pose work while also adding some clarification.
Ooh, I love seeing people's progression! These show a clear improvement from October. You pretty much have the proportions down. The only thing I can tell you're doing wrong is maybe focus on readability with some of them a little more. Some of them aren't fully readable as human poses, but I think that come down mostly to experience rather than any one thing in particular.
I hope this helps a little!