The way that others evaluate you–your photo, résumé, tattoo, or first-date cardigan–follows the same process of placing marbles on a scale as soon as they get any information.
We form impressions of people the same way we form an impression of anything: As soon as our scale of marbles starts tipping one way, we begin to develop a hunch and then start gathering evidence to back that up by selectively picking up the marble that’s easiest to pick up.