Nice work on your Lv. 1 study, indeed. I love how much you've used blocky forms to make the pelvis and ribcage perfectly read.
However, I've got one little idea: I am getting a little bit too much rigidity in the blocky spaces. Why don't you make these forms positively organic and natural in your next warm-ups, though 34 minutes of 30 second quick drawings, from Marc Brunet's video as reference. (2040/30=68 loose and scribbly sketches for anatomy)
The reason why is because, you'd be able to make your form drawings less undertured and more cartoony in your next round. I have don't have lots of time to tell you what underture is, but here is this link to help you get the big picture.
So, good luck, and cheers to your next studes.