If I am working from a live model, then I will make several quick sketches and then scan those into Paint-It. It is fairly simple to move things about.
Once I have decided on the composition I will then begin the drawing. At this stage I concentrate on making an outline of the main elements of the drawing. The details will come later. It is important to get the outline drawing as exact as possible. This is the foundation for everything else to come.
I like to rough in the eyes and nose first. If these features are not 'right' the whole drawing is 'bin' material. It also makes me feel not so alone!