good job on the latest gestures, although I wanna see some more stuff from you
But I can give you some critique on your ones from imagination. So it seems like your poses are very unbalanced, there are some very vague rules about balance that some artists have talked about in their respective anatomy books like in Hampton's anatomy book or Loomis' Figure Drawing for All it's Worth. But what has been helping me the most with learning to get a balanced pose is actually learning more about the pose I want to do.
So lately if I've had to do a certain illustration and I decided on a thumbnail and know what kind of pose I want for the image I'll do loose gesture/figure studies of people in that specific pose. So like I had to paint Poseidon ready to throw a trident (
forrestimel.deviantart.com/art/Poseidon-460584331 ), so I hopped on to Google and did some gestures of people about to throw javelins. And then I took notes, keeping in mind things like how their body is twisting, how much they're twisting, how far back does their arm go, etc. etc.
The same goes for simple poses (
forrestimel.deviantart.com/art/Lilith-464511972 ), like I just did a character in a simple pose just standing but with most of her weight on one leg causing contrapposto with her pelvis and clavicles. But I wouldn't know how to place her legs and feet and body if I hadn't done some research and gestures of those specific poses. So from doing research I learned that in a tough girl, not going to take shit from you, waiting for a fight kind of a pose generally the spine is upright, head slightly tilted upwards to give a feeling of superiority, one leg planted flat holding the most weight, other leg is further from center of body and acting as a support for weight, the leg with most weight causes the pelvis to tilt which then causes the upper body to balance it out by moving that side of the clavicle down.
So I really recommend trying to work on characters or illustrations with characters that will require a variety of different poses and taking the time to research them and why those poses give off a certain feeling to us, I think it would be very beneficial. But only if you do it for something specific, because you need to apply that knowledge to something