I was going to suggest overlays to check your work but it looks like @Jesper Axelsson has done that for you! His advice is on point. Horizontals, Verticals and angles. I would also add that you're figures are pretty darn close! At some point you have to ask yourself how close do you want/need to get. How much creativity do you want to inject in your work? Do you want to be able to copy the photo perfectly? Hope that helps! Keep drawing through effort you will become a master. Just gotta put in the time :)

Very nice mannequins! Looks very fluid and balanced. Your first one seems to me to have a little short legs, but great job!

Hi. I see you get too much into secondary forms. I don't know if you are actually going for that but maybe some simplification could be useful. Anyways, keep an eye on how the perspective of the main masses (head, ribcage and pelvis) interact and change the limbs perspective from pose to pose. Also, I think doing two or three times the same pose is better than a bunch of different ones. So give it a try a see if with each time you discover something different that you didn't observe in the last one. Timed practice is useful to not get off of your goal and actually doing it Hope it helps! Keep up the good practice! Ps: timed practice is useful at your speed. Between being able to do something and not being able to think too much. Hope you have a good practice!