Starting on the fundementals

Hello, I've been drawing for a bit over a year but I didn't start studying fundamentals until now. I'm looking for critique on my 2 minute figure drawings and facial studies.

https://imgur.com/a/hK2lHjy

You're off to a good start!
The most important thing is to keep exploring things and challenging yourself in a way that's fun (or interesting) for you.

For improving the figure drawings, I think what would benefit you the most is to draw the line(s) of action for each pose. It'll give you a visual reference around which to construct the body.
You can also add simple shapes of your choosing to describe each bodypart. Don't worry too much about time limits, but aim for accurate proportions on each first try, and it'll rapidly improve your understanding of the human figure.

I find it also helps a lot to occasionally pick one thing I struggle with and do an in-depth study session of just that - no difficult time limit, just different angles of one bodypart or facial feature.