These are really good but you are doing very small studies I would recommend getting a A2 size SketchBook or doing one frige on one page because having Little space restricts the flow of line which in turn affects your figure drawing

I think you should focus on gesture and proportion before adding muscular details

I'm not sure an AMA is really a place for soliciting critique, and figure drawing isn't really an area I teach, but I can give you a couple thoughts. I noticed that in a few of these - specifically image 6 - you've got some really nice, solid construction on the torso that gives a stronger impression of the 3D nature of the body, although as you move out from there, the construction tends to become somewhat less confident. There are a couple things that stood out to me, in terms of areas with room for improvement - firstly, draw bigger. A lot of these appear to be pretty small, which will severely limit your capacity to really engage your whole arm as you draw. This predisposes you to stiffening up, especially when you try to pack multiple figures into a page. Working on larger sheets of newsprint is definitely well worth it. To that same point, I would recommend trying to draw more of your marks one stroke at a time - that is to say, instead of chicken scratching lines, think about the specific mark you want to draw, and execute it in one go. Taking the time to figure out the specific nature of the mark you want to make ahead of time, rather than figuring it out as you go, will help you think of your drawing as a series of choices that you're making, and something that you're in control of. Secondly - and drawing bigger will help with this - I'm noticing that as you drift off to the extremities - your hands and feet - you don't appear to give them very much attention. This is understandable, given how little room you have to maneuver, but as a result you'll find that if you allow things to slip through the cracks, you're going to end up with a much harder time sorting them out later.

I think the head looks small in all of them and There are proportion mistakes in torso and pelvis in the top two drawings even for a gesture drawing but the drawing on the bottom left hand corner is great 😁

I think the skull has some proportion errors and I think you should first try shading simple objects like a bottle Or a Mug before jumping to complex objects