You are doing the right thing by drawing drawing drawing. At the same time it is sometimes good to be you own worst critic. For me, if I step away from a picture for a day or two or a week even, then pick it up again many of the flaws jump right out. Another quick trick to help spot imbalance is to view the pic in a mirror, or flip it over on a light table, or hold it up to a window or light. Whatever it takes to reverse the image.
I feel that on your second to last page, the guy squatting and the guy standing with his torso turned and arm outstretched are some of the best anatomically constructed pieces you have here.
Keep at it!