I started this in Day2 of the workshop after a couple of Ned's demos. But I couldn't get the oxen's proportion right as well as the colors of the man leading them. Frustrated. Then Ned comes in and brought it to this level.
Since the body of the front oxen was too thick(high), he made its legs longer to match. He didn't move the man toward left, which is the actual position of the man relative to oxens. Instead he made the man taller, especially his legs longer. Needless to say, he made lots of adjustment for colors and values at the same time.
Now this looks very good.