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Pat, as far as I know the classical approach is to have the light on the left. Still, if it works as well or better the other way than why not. When photographing someone than you look for that moment when the light and the shadow are just right. For graphite and charcoal the half-tons play a important part for they hold a lot of detail. Than again it all depends what you wish to detail and what not. If you decide to use the Bargue method than I suggest that you get your outline and shadows correct before starting the half-tons and details. Tape your paper and reference photo side by side. Draw the portrait using a plumb line and the sight-size method. This will train your eye for live sittings. If in doubt about something feel free to ask.
Sincere wishes,
mischa
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