I was out visiting my sis in law last weekend and we did a bunch of photos of her kids as well as a family portrait. I had my background setup, chair for the kids to sit in, and everything ready. As I started shooting child #2, I looked up and I saw a face peeking over my backdrop. Since I only had my 50 1.8 on my camera, I walked up, snapped an image, and then realized I forgot to change my settings. I made a quick change, but she was gone. It was pretty under exposed, and I decided to keep it any see what could be tweaked and if it could be saved since I loved her expression.
4 stops under exposed, a little brightness & contrast, little cropping, B&W treatment, and this is the result