As sweet as it would be for you to say that to someone and really mean it, while it's not common to receive a complement as such, I think I would assume you were BS-ing me and trying to test me to get a reaction... and proceed by telling all of your friends and making fun of me for it. I've dealt with a lot of assholes who do things like this only to spit in your face and kill your self esteem.
I think most women would find that really unsettling lol you'd have to be like brad pitt to be able to get away with saying something like that and having it not freak someone out and even then ted bundy was a handsome man but he killed a lot of women using the "you're pretty" line and his charms. so women are like antelope and we feel like prey most of the time and if a lion comes right up to us seemingly in full hunt mode? we're gonna run, just sayin' lol