Excellent job on your figures, hands, and feet, Eunlan, especially on your gestures and proportions!
So, if I was to give you a completely honest suggestion: it would be to please go right into the lines of action with 34 minutes of 30-second poses? The reason why is because, as a result, your hands, feet and figures will have a more unprecedented range of movement, like you've never done before or since.
Hope it's been completely and totally constructive.
or if you can spend money i highly recommand brent eviston's gesture drawing course on udemy, there are sales often and it's really cheap especially considering the quality of it.
i also feel like your shading technique is a bit messy and i think you should learn what i said above first with no shading, i think learning structure first will make you understand crosshatching better, then you can add shading, i promise it'll be easier!
i see a lot of potential in you, if you work on these just for one or 2 weeks your drawings will look amazing i'm sure you can do it :)