I think you have good proportions over all in your figures, but you do need to think about gesture to avoid having stiff poses. I took the first drawing and did a quick sketch to show you how you can make little changes to create more gesture and flow, I hope it helps :)

Hey there! I notice a big improvement from the first drawings to the most recent, so great job :) There's more fluidity, rhythm, and overall understanding of the human figure. I think the animal drawings are also well done, but what I notice as a main difference between the human and animal drawings is that the animal ones tend to have stronger shape design and gesture, which is key to constructing a more appealing drawing. I would recommend focusing on bringing more energy into your human figure poses, with emphasis on the line of action. So as you start your gesture, first find the overarching direction, and then try pushing it even further, so you can set the foundation for a more dynamic figure. I think once you push your poses more, it'll be easier to bring in appealing rhythm and shape design. Something else I'd like to point out is the tendency to draw smaller feet and hands with larger heads. It's great that you are supplementing your practice with anatomy studies, and it's definitely showing through your figure studies, so this is just something to keep an eye on as you continue to practice. Plus, this video goes more in-depth over general proportions that I think you'd find useful: https://www.proko.com/s/9sB5. In the end, it's the familiarity with the subject, in this case humans, that will allow you to design stronger shapes, poses, and overall drawings.