Is it possible to turn the table so it runs the other way? I may be wrong but based on the picture it looks like there isn't much space to walk around the table to get to the chairs and buffet? Dimensions would really help if you would like to provide. As is, I would do some colorful art on the wall above the buffet that picks up your wall color and the chair slipcover colors (is that green?) and matching lamps (not black).
If it were my dining room I would probably reorient the table, move the buffet to one side wall (if there is room, if not I'd remove a leaf from the table and put the extra chairs on the side). Over the buffet I'd probably do mirror and lamps and then on the opposite wall some art in similar scale to mirror. I'd also either replace or recover the two end chairs with something with more pattern/color to tie in the art. Then on the wall buffet is on probably a grouping of art or maybe family photos. I'd probably go with a more colorful rug too.
Its hard to tell colors from the picture but I bet introducing some navy or another color will be very pretty.
This is of course my opinion I think its a lovely dining room and an excellent base for decorating!
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