Here's the before. Not too much wrong with it, right?
But look what you can do!
I was going to keep him in colour because of his beautiful blues, but when I tried the B & w (with cinnamon) he just looked adorable too! Children look so gorgeous in black & white.
The main thing I had to do on the original photo was even out the shadows on his face using the clone tool. Then I lightened, warmed, sharpened, made it contrasty, and voila.