Hi! Since no one has a go on commenting I’ll do.
I like the picture. It has everything I like about low-key and everything I dislike about it. So I’d guess it fine. My only criticism would be that his arm is a bit distracting. And in my view, low key is used to dramatically channel the viewer’s attention towards the subject, so the arm is a bit too bright, I would say. Maybe in PP you could solve it slightly if you agreed with me. And by the way, would the frame be for him or for displaying your photography?