...the problem is there is too much light from a window on the side of his face. Can this be repaired?
Yes, but it ain't easy. Since the are is blown out (or so I assume), there is no color information there to enhance. What you need to do is clone in some color from other areas of the face. That is the easy part, the hard part is blending it in convincingly. It will take some effort but it is doable.