Thank you very much for the feedback! As for drawing with the shoulder, I got a bit confused and unsure if I was doing it right. About halfway through the lesson, I tried various ways to activate my shoulder until I felt one that was just right, some of the wobbly lines are due to those "experiments".

As for the rotated boxes, I had already done them but forgot to scan them! I updated the album and posted my rotated boxes at the end.