My general fashion sense is "Do I like this look on other people? If yes, then steal". I greatly prefer beards on men, so I sport on myself.
So with beard style, I say trim it in the style of what catches your eye in men and what looks good in the mirror, and go with it!
I know this probably seems like stupidly obvious advice, but I look at it as "If you think it looks good, it's probably good to go." That's the line between looking good and just not caring.