the direction of the light is really easy to see here and the value gradients coincide perfectly with this strong lighting. I love the way that you make your brush marks and though the size of the brush seems to be relatively consistent; which usually isn't a good thing, it works very well here. the expression gives a sense of this figure's personality and serves to warm up the image despite the cool colors. not a big fan of this kind of composition but it seems to work. I'd add darker values underneath the chin. about as dark as that dark spot on the forehead. make it go to the left (our left) so that it's consistent with the lighting. really good job.