@Tiger Gayle-Walker, one very important thing for this exercise is to draw the muscle based on how it interacts with the bones underneath. So try this: instead of tracing the muscle based on the shape it shows on the surface, visualize the bones the muscle attaches to, then draw each portion by connecting their origin to their insertion, considering the muscle’s form and volume. If needed, draw-through (as if everything is transparent). I think it also helps if you lower the opacity of the photo a little bit more just to better view the tracing lines. Hope this helps!