These look absolutely fine. You just need more confidence in your lines, with more practice, you can improve them with no problem. Now the wooble of your lines is becuase your are going over the ellipses a little too slow, try your best to be smooth and a little quicker with your stroke. As you can see on mine even thought they are not perfect, they look a little bit better because of the smoothnes of the lines. In this type of exercise is best to be smooth first then be accurate second. Then over time you can be more accurate | Artwod Feedback