if you had used a reflector of some kind (an actual reflector, white sheet, something cool colored and reflective) to lighten up the dark part of this mans face, it would improve this image a lot. It is a nice image. nice clearity and focus.
Nice attempt at side lighting to give mood to the photo. The light source being at the top rear side of the model has left some need for fill light on the models right side in the facial area. Also the blown specular highlight on the scalp could have been dealt with by cropping or some other means.
This is a face with character - it shows a great amount of personality - everything from mischief to wisdom. Somehow it got screwed by the dark condition which hides the face almost in half - from no detail to too much detail. This could have been a Top Five image if a little more thought had gone into it. Really unfortunate that it came out this way.