I think another important thing with passing as male, as wel as all the above is CONFIDENCE.
Most males seem confident, almost dominant. When sitting they take up space to show dominance, when they walk they have shoulders back and head high to show power.
If you're self conscious about how you're walking and constantly checking everything it'll be harder to pass. Just relax and show outward confidence, even if inside you're freaking out.
Some things I try to do, for example, is if I make eye contact with another male, I don't smile, just nod. If I'm meeting new people, I go in for a hand shake instead of a hug or just standing awkwardly. Again, that shows confidence. If I'm sat down anywhere, I sit with either my legs apart or if I'm on a sofa I rest my arm along the back of it, taking up more space.
I'm sure more thingss will be somewhere on the interwebs, but the most important things in passing are:
BEING YOURSELF, BEING HAPPY AND BEING CONFIDENT.
-Matt