trying to improve figure drawing

Hi, this is my first time posting on Reddit! :D

I'm currently trying to improve my figure drawing-skills. Here's one on the first day.

I first drew the torso, using the bean bag method, then the two boxes method. I then followed up by drawing cylinders for both arms and legs. For the head, I rushed it. My bad lol

Overall, while I got the general pose right, it still feels stiff, and I can't pinpoint why. Maybe it's because I'm still not confident in being able to draw. Maybe not.

As such, I would like someone who has more knowledge than me to provide constructive feedback on this. Thanks in advance.

https://preview.redd.it/imfgqso89qud1.jpg?width=3024&format=pjpg&auto=webp&s=ea7d15764de2213d6285713ccd096c0f09d2c665

https://preview.redd.it/zan5bcg99qud1.jpg?width=564&format=pjpg&auto=webp&s=9d944a058b22a244972b91681cfcf97b693b060b