How do you know if you are good-looking to a per by?

body language. You will always command more attention when you carry yourself with more confidence. Pay attention to how people react around you, things like, when sitting next to someone do they cross their legs toward you or away? When you make eye contact, do they drop their eyes? If someone gives you the "double-take" than it's a pretty good indication that they think you are "hot"! Hope this helps!