Critiques can only get you so far, you will want to spend time studying human anatomy and more importantly, train your eye. There’s a good book I would recommend named “Drawing on the Right Side of the Brain” which explains the key difference from people able to draw, and people who are not able to draw.
I hear the best way to get good with human anatomy is just look at a RL human figure (photo or model, your choice), and try copying exactly what you see many times. You should be more familiar with human anatomy this way when you spend more time studying the human body in great detail.