Hi Jan, I think you have very nice line quality and you're getting some very solid looking figures (especially the second image). I also feel like you have some good gesture lines happening in most of your figures. My suggestion would be to cut back on the details that aren't needed to tell the story of the pose. Alternatively, you could extend the amount of time you give yourself for each pose and before laying in detail, place the major bones (e.g. a simplified rib cage and pelvis and direction lines for limbs.) This is something that helps me with proportion when adding more details. I attached some examples so you can see what I mean by this. I made some light marks to indicate these landmarks. Also, don't be afraid to use more straight lines. I think your first figure on the first pages' upper thigh would look more natural with a straight line on the top part of the thighs. Hope this helps!

Hey these look great, you seem to have a good at seeing proportion and overlapping forms, and this will only improve with time. Something that really helped me with gesture (as opposed to more detailed/finished pieces) was using a chunky tool. I used crayons or oil pastels and I also use websites that will only give me a figure for a set time period (e.g. https://quickposes.com/en and https://vimeo.com/channels/1300087 are good websites for this). This forces me limit myself to trying to just capture gesture. I recommend trying it out. I attached an example of a 2 min one I did the other day.