Hi Ecrivaine32.

          Body language of coarse speaks volumes!  You can tell if someone is confident and relaxed, nervous and afraid, lazy, anxious.. all by body language and how they carry themselves.  So I think it's important to stay aware of yourself, your body, at all times!  Eye contact is another way you can judge a persons confidence level. So look them in the eye as much as possible when you speak.

And of coarse 'brains' are always sexy! Stupid or overly opinionated, men and women become unattractive real fast!