In my opinion, in appearing female, most certainly facial appearance has a lot to do with it but there is so many more things that have to do with appearing female and passing successfully.
How you walk, how you sit, how you move, how you eat, how you are groomed, how you talk, your voice pitch, etc, etc.
Just go to a mall or a busy street or restaurant and watch the differences in the things I mentioned and also between how females and males interact with each other.
Danielle