This painting looks pretty darn good and I congratulate you on your win!
However, I want to make some comments about your methods and technique.
I've posted your underpainting and the finished paintings side by side. Although you have chosen to paint this fellow in extremely difficult light, you have done a pretty good job of it.
When I do an underpainting, I try to make all the value relationships the way I want to see them in the finished painting. That is, the values are an important component of the composition in the beginning stages.
On the left, the figure is more integrated into the painting's background. You have successfully lost and found some edges and the composition is more of a "unified whole."
On the right, the figure does not relate to the background as well...you have changed the value so much that the contrast is greater and thus you have changed the design of the entire painting.
You may have intended to do this and that is OK.
But the beauty of an underpainting is that you have worked out a pleasing arrangement of shapes and values. With the addition of color, you need to carefully honor the basic work that you did in the underlayers and not alter it so drastically.
It ain't easy.