Well, I think passing for every guy out there is different.
There's basic things you can do as far as 'beauty routines,'
Since I began 'trying' to pass, I definitely started doing some things, and stopped doing certain things.
I let my beard grow out as soon as possible.
I get my sideburns cut flat, not pointed.
Obviously, I don't shave much of anything anymore.
I bind.
I pack.
I layer my clothing like crazy; Three loose sportsbras, one high impact sportsbra, a football compression shirt, one to two tanktops, a t-shirt, and usually a button-up collared shirt, or a hoodie to make my chest look flatter and to hide my curves.
If I feel like my lips are too rosy one day, I'll rub a teeny tiny amount of foundation on them to lighten them up, since most men don't have a lot of color in their lips.
I feel like you probably already do it, but...men's underwear...
My pants always manage to wriggle down, and there's nothing more emasculating than having girly panties ride up your backside, and nothing will cause people to give you stranger looks...I speak from experience, unfortunately.
As far as mannerisms;
This is where I don't even try anymore.
I tried to adopt guyish mannerisms, but I started to feel like I wasn't being myself anymore.
I'm a particularly girly type of dude, but I'm fine with that, and I get told by my friends that it 'works' and that I pass often because society seems to think that artistic guys can be flamboyant and feminine, so hey, go me.
I can't seem to walk like a man, but I do walk differently when I wear my packer, because it gives me something that I can actually feel, and have to adjust to.
I guess the only man thing I really do, is sit like a man.
Men sprawl and take up space whenever possible (I learned this from drawing, believe it or not)
Men also walk differently, instead of walking on an invisible line like most women do, men walk with their feet on either side of a larger line with space between their feet while they walk.
The best advice I can give you, is just to watch men of all ages.