Fitness - not only is a fit body nicer to look at, but it conveys a lot of subconscious information like good diet, strong character, persistence.

Fashion - shows that you care about how you look, that you pay attention to detail, and also reflects your own sense of self-worth.

Grooming - displays that you make time for self-care and that you care about the comfort of others around you.

Posture - nothing says more about your confidence and self-esteem than how you hold yourself.

Eye contact - not the bullshit IOI you kids think some woman gave you on the bus, I'm talking about looking into someone's eyes when you speak to them and when they speak to you. Shows attentiveness and investment when listening, and adds strength and power when speaking.

Humor - not being a clown, but definitely making occasional jokes, or using a funny voice, makes it clear that you are not overly intense or taking life too seriously. Shows that you can be fun to be around.

Daringness - doing things that shy or timid people are afraid to do, like giving a speech or singing a karaoke song, approaching and talking to a stranger... and definitely DANCING. It shows that you're confident, comfortable with yourself, and unconcerned about the opinions or judgments of others.

Speech - And a huge one that very few people think about is how you speak. People who use pause words like "um... uh... like..." and "know what I'm saying" sound less intelligent and less confident, while people who use a firmer, tighter language and who can simply, comfortably pause silently — without a filler word — really project a great sense of always having their thoughts well-collected and a great deal of confidence in every thing that they say.