I like it a lot too. It is a great shot, and portfolio-worthy.
Photo-wise, I would change very little. If I had to nitpick:
- Maybe bring down the luminance of the red chair back by half a stop or so. It's really bright.
- Catch light in one eye but not the other, is a little odd. Clone one in or clone one out.
- I'd like to see an edit with a bit more vignette - just to compare. What you have is probably just right.
- I might like to see a version with a very subtle/soft kicker light, opposite the main light. Might not need it, but I'd have to compare.
Styling-wise, the coat doesn't seem to fit very well, it's almost swallowing him. Maybe it's an older coat and he's lost a lot of mass/weight?