They are good very good lines I believe Ethan Becker usually say focus on the shape of the torso. The arms and legs are just tubes. You can add detail with the construction is mostly solid. It also helps to have a focused goal and do one thing well then move on. My goal is to do character design so I need to practice tons of gesture drawings. I tried to do at least 15 mins. If your goal is to improve anatomy ask yourself why? What is the end game?
