You're right of course, Ash, getting faces is key. It's also the most difficult part as it involves a certain amount of (appropriate) aggression and the potential for confrontation. Bruce Gilden is at the extreme end of this, but I think you need a measure of that kind of attitude to really capture character. At the moment I'm trying to improve on composition and catching expressiveness of the human form... Whilst working on my courage for the more in yer face shots like this...
Not so great compositionally, but I like this for the attitude the guy was giving me.
Mischivo, I think that's why the last one works, I like it too. You get a sense of the couple from how they are huddled together almost.