Never ending heads!! You are going to be the head master when you are finished this summer. Hey I think you are doing very well, but maybe a word of advice that helped me very much a while ago; focus on one step at a time, dont worry about the details while you are also figuring out the structure - such as shading and hair and nostrils, details. And then when you do the shading, be more careful! take your time, whos in a rush? Its summer maannnnn. with crosshatching try to fallow the contours of the figure. Rock on.