Your centre line is made up of two seperate lines that overlap, I think making this one curved line would help a lot. I think making your shapes even simpler would help as well, I think the left leg suffered from having the shapes too complex. But that being said the right leg looks amazing. Make sure you're having fun with it, you'll get a lot more out if you're enjoying it rather than trying to slog your way to the finish line.

That's dope

I think for the arms and legs try to simplify them, it’s better to capture the gesture rather than make it look like a person. make sure to add a centre line as well, this can really help capture the movement.

thats really impressive doing this from imagination. i think I have a similar issue where I tend to stiffen the pose, I think the best thing for it is to keep at the 30 sec gestures to make your mannequins more dynamic

I think focusing on the center line will help a lot, try exaggerating it, and show the curve at the top and the bottom, I think moving on to the beam exercise will help you understand this concept

Wow these are incredible. if I had to come up with a critique it would be that where your neck connects to the body looks a bit stiff I would take slightly more time figuring out the placement of the head relative to the chest, but overall they are really incredible

I think you're still focusing on making them look like people. The idea of this exercise is to strip away all the detail. Focus on exaggerating the tilts, leans, twists and foreshadowing. Also add more of an overlap on the circles showing the closer one on top. This is more of an exercise to get you thinking about this kind of stuff and less about producing a realistic torso.

I think working on getting more dynamic centre lines would help a lot. Try giving a few of them a more S shape for the lower back.

These look great, I think try and use less lines, in some of these you could have easily used one line flowing from the torso down through the leg.