Estás guapo/a has a negative connotation? :)
The reason why I ask this question is that to my knowledge, the verb "estar" is used with adjectives that refer to characteristics that are presumably temporary, so according to this rule when we say "estás guapo/a", we mean that you're usually NOT so handsome but on this very rare and special occasion, you deserve to be called "guapo/a" thanks to your clothes or make up, etc. Am I right?