There s no formula for a good impression. Sorry. Okay, I m assuming you are talking about being attractive and loved or at least liked. I ll start with the clever part. A nice demeanor obviously helps. You need to read your audience and see how they react to things that you say or do. It sounds like trickery, but girls (and guys) do it all the time, sometimes without even noticing. Those that do it well can pull off anything. As a guy, you don t have to look like Johnny Depp to make an impression, for example. With that said, honesty is the best policy (I know, a contradiction, but it s true). Physically, just go with the current fashion. Some gals like to stick out and get noticed, but that s a turn-off for many guys unless you can pull off the exotic look. Gain your impression with your personality. But for features, the thing I notice first is probably one of these (not in order) lips, hair, butt, and just general figure (I happen to like hippy -- not hipsters, hips-- girls with small boobies; some guys like big boobies). The eyes are like a weird bonus. If she has pretty eyes, then I m sort of hooked and interested even if I don t like her that much. An annoying voice tone can only be overcome with high ranks in the other qualities. I don t like aggressive women, but I know some that do. And then there s the thing you can t quite explain. You just like the person but don t know why. Edit. I m assuming, of course, you are talking about dating or meeting your mate s parents or some new friend(s)