We've noticed that kids are eager to have their pictures taken but it's not unusual for adults to balk at the idea. Not sure if it's "I'm not looking good till I put on make up or comb my hair" or, I swear, some seem to think this might be an FBI sting or their pics will end up on the post office wall. In any event, it's helpful to me as I can readily link a disease to a face, so to speak, but have trouble linking a name to that face. Bringing up a face with the chart dispels the anonymity.