This would be my first 3o min. drawing.  As far as learning from this class and this drawing there are some key points.  One, realizing that it's important to get a basic line drawing to measure out the body's length and proportion.  This can really speed up the process of drawing because having the correct proportions allows for less erasing and frustration.  Second, understanding the models body form in relationship to your own form. Third, keeping an appropriate distance in relationship to your drawing board, this will allow flowing forms through the shoulder. Fourth, making sure that your drawing board is at a position that has a clear view of the model, this will make the drawing flow quicker.