auh - skintones will be a definite help!! and you're right about their height... my mum is a retired archeologist who did a few years worth of work down in Peru, Ecuador, Brazil and Venezuela, and though a lot of these types of aboriginals do not like to have their pictures taken [well, the kids don't mind, especially if you pay them...hehe], mum was very discreet and has some just amazing photos of these people :))