Hi there Dr. D.
This is a wonderful image. The rich colours, sharpness, clarity and wonderful depth of field are striking. I see where you think this gentleman could be a painter - he's got that look. What deep character lines he has - certainly a very interesting face.
If it had been possible, I would have put a bit more separation between the subject and the back walls for an even creamier looking depth of field and further subject isolation. Also, getting a bit more light on the left side of his body/face may have added a bit more balance.
Really a superior looking shot, Dr. Looking forward to more of your work.