Nice effort. Let me address a few problem you're having. Throughout all the drawings I feel that you're not measuring and you're being led astray by your assumptions of the face. The chin is often too wide in these drawings and the perfect thirds are varying too much. Measuring is a big part of this method, so don't skip on it. Pay attention to the width of the front in relation to the length of the side, make sure your perfect thirds are the same size, your circle is the same height and width and your oval is the correct size. Second thing is construction. In a lot of these drawings your horizontal lines are not converging to the right point. Make sure they are parallel or at least slightly converging. Remember that all of these are construction lines. If they are in the wrong place it will be difficult placing the features later on. Best Regards and keep drawing.