depending on the time you've been practicing drawing there is not much to improve at this point.
proportions are overall right. the poses feel quite dynamic. your lines seem confident.
keep practicing like this. revisit the basic now and then. and try to stay relaxed.
its notable that you study the basics well.
allow yourself to exaggerate the flow and dynamic of the poses. they become stiffer as you add details. (not just for you, thats general) allow yourself to draw more on feel and not specific what you see.
