They are all great examples of the underlying forms that a figure can be built out of as well as a way of understanding the facets of a figures masses and how the edges of light could be realized on such stark forms. Keep it simple, loose light. This should be an investigation into an artist's thought process and a mental/visual library strengthener more that cute little drawings. (images by Cambiaso and Hogarth)
Sorry that I couldn't figure out a way to get the picture links to work.