I know i don't smile a lot either when I play. I, too, have the *I'm about to poup face* syndrome.
On the other end of the spectrum, check out link #2 above for a nice & smiling player (what we should all aim to do). This is Robert Boutet, one of the better Quebec players. It is a good reflection of the French Canadian style too.
Hmmm. Good question....
I'll let you know next month. I'm going to a diatonic fest in Memramcook, New Brunswick, where there will be several good quebec players.