Jesus. Preferences about having a beard or long hair or whatever is going to depend on the woman/where she lives/her social circle/age/etc.
If every woman didn't like some sort of look, no guys would have that look. Do you see guys with long hair, or with a beard? Do you see guys like that with women? Okay then, you answered your own question.
If you wanna grow your hair or a beard, do that shit. The question you should be asking the women is if some particular look might look good on you personally, or if what you've got going on right now is in need of some sort of change. This would require pictures, and would probably be more helpful, unless you're trying to get with Devolution, in which case you could ask her directly what she specifically is into.