I feel that you give to yourself a very good critique. I also feel that probably you can have drawn a little bit more with the time you use to write your own critique. Seem you do not feel so confident with your line work i suggest to begin your drawing sessions warming up with some line exercises. Spent ten to fifteen minutes before you go to study the thing you are more interested about. Keep going with drawing the heads. Draw a 100 Loomis head until you get used to them! Keep it up! | Artwod Feedback