Basicly yes, you did it "right" but I think you missed the point a little. You drew the shape of the muscles correct for the most part, but the lines going over the muscles look like an afterthought. These lines are meant to describe the volume of the shapes of the muscles. To show how they bulge out or stretch accross the form. Also, your lines look very unsure and shaky, which is understandable, and will improve with time and practice. I did a quick sketch to show you what I mean, I hope it helps :)