/ic/ - Artwork/Critique

I've been trying to draw correct anatomy in different poses (other dan simple ones) but I seem to make quite some mistakes. Am I correctly using my construction guidelines? Or did I already go wrong there? Note I did not want to exactly copy the reference's pose, just use it to try to envision how the body would look if the pose was a little bit changed.

I added a few different stages of my drawing process in the picture.