So use one word (and preferably not just a trait, unless your sim really the epitome of insanity, genius, etc) and one picture of the sim in question to describe a sim You can do this once per sim.
You can make it two words if it's something like fashion lover and the word fashion or lover wouldn't work on it's own and you can't think of a one word equivalent. But if it can be one word, use one, like use fashionable instead of fashion lover. And only one picture please Picture quality/size doesn't really matter, just as long as the sim is visible. Mine are going to be low quality for example because I can't play my game on anything more then low quality.