Classic Single Light Portrait

I was walking through the kitchen the other afternoon, and looked over at my wife.  I then saw what must have struck some of the old masters of paint.  The classic single light (window light) highlight of a beautiful woman's face.  

We see scenes like this everyday.  We see the instance where the light strikes something and we think, "Wow that is nice... very pretty."  Here is the rub.  We need to capture those moments, or at least know how to recreate what we saw (and sometimes improve on it).  

I happened to have my camera handy (I know, shocking right?).  This was shot hand held, and then processed in Lightroom 3 and Nik Software Color Efex Pro.

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