What I don’t like Nothing, I can’t say there is anything wrong with picture or give any advice as far as improvements.
What I do like the The style and technique you used to make this. The Background and blue light outline, the lighting coming from the top left, the detail in the suit and the muscle in his arm.
To be fair I actually find it a little hard to say much about it because it seems you have refined this style so much that, its almost perfectly consistent. No one part sticks out horribly, like as if you had trouble with it. And no one part seems so good that takes the attention away from the picture as a whole. I’m not really sure if that’s good or bad. To me it’s like you made it in a very professional way.
All in all¬ Although it’s not too striking, it’s nun the less still A GREAT picture.