This is a great shot, I like it, but if judged by the striсtest pro standart, I would pick these faults:
1. the guy is too much to the right - there is a space between his right shoulder and the frame, while his other shoulder is cut off and blurred, and it all creates the wrong compositional balance. The texkam edit makes it more balanced, but does not solve the problem entirely: it became too tight and i do not like half blurred business suit. This composition may work well with , let's say a vulnerable girl, but a self assured businessman has to have space in front of him, not behind him, if you catch my drift. It is a psycological thing.
2. I like the bookshelf, but the verticals and horizontals there are bent, due to the shooting angle and it is a bit distracting and untidy for a pro business portrait.
3. Way too much unnesessary gray/blue space in the lower left corner. It makes the image unnessessary heavy. Again texkam addresses this problem
4. His posture is a bit unnatural - it is debatable, but I personally doubt it is his natural pose.
5. The lighting was already mentioned.
6. His cuff looks untidy, as if it was not ironed.
Other than that - very nice.