What I think you need is art on the walls, I like the light fixture and BTW chandeliers do not have to match anything else. At least a nice roman shade on the window since the trim sort of negates the use of drapes. A rug might or might not fit in the space you need at least 3’ all around the table for the rug and from what I see it might be better to not have one ..

If you need to protect the top of the buffet then have a glass top cut for it and get rid of the doilies.

I would rehang the mirror and add candle sconces to each side

Here is some inspiration.

She doesn’t have a round table and IMO a rect. one on an angle does nothing so not sure what you were trying to show. I do like the foyer idea though

She has a round table in the other room, and I wasn't suggesting anything for the foyer except inspiration.

Your buffet cabinet looks like it’s a tad bit too big where you have it. Why not place it on the long wall with a beautiful piece of artwork or a mirror over it? It will be a nice site to see when entering your home from the front door/foyer. Then turn your dining table to run parallel with the long wall.