The message This is a nice portrait. The camera makes it clear that the subject is a photographer, and the low key and hiding most of the face behind the camera and hands give it an air of mystery. The one eye that is visible is expressive; this is a serious photographer.
Creative choices The natural light is very effective; it nicely lights the one side and leaves most of the image in shadow, producing a good low key image (although I find the bright reflection on the camera distracting). Black and white works well. I don't like the vertical line on the left side (edge of the mirror?) or the horizontal lines in the background, and there is a somewhat distracting line at bottom center.
Technical aspects Focus and exposure are just right. Tonal range is appropriate for the low key approach. Sharpness is just right.
Nice choice to use limited lighting... a portrait that really conveys the photographer's tendency to stay in the shadows rather than in front of the camera.