Same angle, different expression. When you finally hit the good light, take lots and lots of frames, then pick the best one on the PC.
On the other hand if the lighting's bad, change position immediately, don't shoot 200mb anyway in hopes that you nail such a great exprassion that it saves the day....
Go back to the first pictures, the ligthing really looks harsh now, doesn't it?
Link to the flickr group of the photo course this tutorial is part of.