if you ask me, i'll say you pass.... (no, that's just a bad joke)
i'm honest, even honest enough to tell people that "i think you...". because it's only my personal opinion, and i can't really know how anyone is outside the picture they posted. not that i post often in the do i pass threads, i'm often a bad judge. being pansexual means for me that i easily see what impression i get of someone's personality more than their physical traits, unless they're very strongly to one side or the other. a bit like this case on a very different forum who's not tg as far as i know, i knew he was a guy all the time, even the pictures he posted were of a guy, but i still only saw a girl. wouldn't say he looked like a girl, he just seemed like one.
anyway, there are also cis people who don't pass as their gaab. when they say they're one or the other in an offended tone, they're usually believed, aren't they?