Hey!
These look pretty good! And you can definitely see a lot of improvement, even in day 1-3.
Although I'm not an expert, heres the advice I would give:
-Watch the proportions, in some of the sketches the hips are almost bigger than the ribs! Since this is a quick sketch its easy to so that.
-Getting the distance between the hips and ribcage right. It's hard to tell if it's right at first glance, but the full drawing can end up looking weird. This is something I'm struggling with as well.
All in all I think you did really well. The best advice I can give you, though, is to keep practicing. Have fun! :D
