I think a little more fill from the front is needed. The face is too dark for my tastes. I think he looks a little out of kilter... a more natural lean forward, he feels like he is going to fall off the posing stool.
Light placement is never wrong if it is what you are looking for.
I would do this shot with three lights... one on each side, and one at or below camera level. I see a lot of these kind of portraits done with ring-light fill.
Good job... I think it is pretty good, you asked for the input.