Bravo, bravo, leofelco,
That's a very genuine job on the face. Love how much line economy on the face, but I've got one small critique: I love the minimum amount of lines, but why don't you please shrink the line mileage, thru 108 minutes of 29 second face and expression poses???? (108x60/29, 6480/29=about 223 poses) The reason why you could do this drawing trick is because, it can not let you think about of the drawing, but it can and will help you speed up the process in the drawing of anything. Not only that, but it could help you be ruthless in your economy of statement, plus it can help you draw larger and looser.
My hat's off to you, and I hope you'll find this completely and totally beneficial and informative.
And here's the useful video to you.