In some cultures taking a photograph of someone is deemed offensive, even if you ask nicely. Some folks just don't like it either, one guy I know will grab your camera and yank the film out. So why not just ask the people around if you can photograph and digitise them? It would save you a lot of hassle, no copyright issues, poor quality source material etc. I've found when playing with digimask some friends are really flattered and fasinated with the idea of being a 'virtual' head.

Pinky - you left the lens cap of your mind on again.