It's pretty but color would be nice. A very light blue from the painting on the wall over the chair rail perhaps? Keep the serene feel.

I agree blue would be nice, but I would paint the entire wall chair rail included in a pale blue. You have a lot going on with the chair backs, orb chandelier and rug so I wouldn't break up the background

The framed art is not staying. There is a smaller hutch matching the table coming so the large piece is gone. I was thinking some color in a rug with a dark accent wall and just a mirror over the hutch
that will match the table ? Too much?

Rug will be nice. No accent wall - an accent wall usually has no doors or windows. A dining room doesn't lend itself to an accent wall. Art would be better than a mirror