This was actually taken some months ago, when I first got my 50mm lens. I converted it to black and white in Photoimpact, because in the colour version, Jen had a bit of a spotty face, and they aren't as obvious in black and white. I used available light from a nearby window, and a large aperture (sorry, can't remember what no.).
I think I have more pics posted of Jenny looking serious than smiling, because if I ask her to smile, I sometimes get a bit of a 'fake' smile. The ones I like where she is smiling, are the ones where the smile isn't forced. I suppose, one the whole, she tends to be more serious when I'm shooting candid shots.
I agree with Reynaldo and you have also a special subject for your shots. I'd just like to see something a smiling Jenny or did I missed her smile in other shots of you? I'll go to see in your Portfolio.