We could hang plates/ platters on the wall. It doesn't have to look like a grandmother's home. This looks crisp and chic.
It would be pretty to put sconces on either side of your mirror - i.e. the lights on either side of this art. Also, we could find a piece of art/ or pieces of art to put on the opposite wall.
You could hang the mirror on the wall opposite of the buffet, and then hang black and white pictures in the shaped of a grid above the buffet. I would actually hang the mirror in the other direction.
I like the larger lamps in this pic
idea of pics in grid
leave mirror above buffet and do pics on opposite wall
Grid for opposite wall of mirror and buffet
mixture of chairs looks good