How I can improve my poses

I always had problems with poses and gesture. I don't think I'm particularly bad on anatomy, but my poses always look pretty stiff and without life. Also it's pretty difficult to me to make new poses from imagination. So I enter in this page to try to practice poses every day and try to be better at drawing poses and gesture, and I would want any critique and or advice to be better at it. I'm struggling with the clases. 

Here are the drawings I made yesterday in the 30 minutes class, they're divided by the amount of time I drawed every pose: 
https://drive.google.com/drive/folders/1MTILCRiX5JOu8MwHi7CkR636b1LjezEB

hi Eli
uhm, generally i think the way to improve that poses from imagination muscle is to actually, create a pose from imagination (i struggle with this, but i do try)

also on your photos, i think your low times are getting good flow and gesture, while your longer times have good proportions to them. maybe you're losing some of the life of the gesture as you start giving yourself more time to get it down ?