Ahh Penny - finished far too low. This is a great portrait. Does she have a copy of it? I think every time she looks at it, that will become your reward :)
Nice high key, I love the tone. The black point and dense shadows work well here because of the subject tones and complexion. The hint of square in the background works very well in leading to the subject, much better than a uniform background would have. Is this a very subtle tritone or pure grayscale?