Tracing is a good tool to get your hand used to making the right shapes, and can help some with accuracy. You'll want to use a variety of practice tools to improve at art overall, like adding in drawings of different lengths and subjects.
Don't be discouraged. Drawing is a skill that takes time to learn, and anatomy is especially complicated and difficult to study. Focus on the process of learning and practicing often instead of worrying about results. Even the masters have bad drawings in their sketchbooks. The results you want will come with time.
Your anatomical breakdown looks solid. Keep at it :)
