What makes a guy look "tough"

[Dizaster]

I was just thinking about this earlier today as i'm studying body language as part of this whole pickup thing, and I think body language is HUGE in how other people see you.

Now you know when you just see those guys who really look like the can handle themselves.. Not because of tattoo's or a big leather jacket or huge muscles. There is just something about him.
I've thought of a couple of things. He doesn't look too serious or too happy. He might have a little bit of a cool smile, but you know he's taking things serious.. Even if their is shit going on around, he looks and stays completely cool. Doesn't make sudden movements to look around at stuff that is going on. Stands or sits up straight.. Not in a stiff way, but just like, he's not trying to shrink as if making excuses for his own waste of space... But at the same time, he's kicked back and relaxed. Not like, beer belly couch pototo kicked back, but like, a MAN in his favourite chair at home, reading a newspaper.
A BIG one, he isn't afraid to hold eyecontact.. Not staring or eyeing you down, but when you catch site of him and you lock eyes, he still looks completely relaxed and unphased.. He doesn't look down or away unless as if something else has caught his attention.
I'll hand it over to you guys for anything you can think of to add.
I've got 2 examples of situations i've been in lately where I think body langauge has played a big part in how i've been perceived by other people, and I find it a very interesting subject. I'll post about those in a little while.