The video I kept alluding to, of Alison Bechdel talking about and showing us her drawing process (which depends heavily on posing, reenacting, researching, producing photos from which to draw), is here (in .wmv format). It’s short and worth a watch.
There’s also a longer video interview with her here. I’ve only skimmed it, but if you found Fun Home particularly interesting (which I hope you did), it may be worth taking a look.