One large piece of original art?

The contents of the glass-front cabinet look more like “office” than “dining room”.
Do you need two lights over the table? Are the long side of the table and the long side of the rug running with the longer wall of the room?
The room needs some color, which a nice piece of art can provide. If there is a window, drapery panels can add color, too.

the issue I'm having with a piece of art is I can't find one that matches the room. since the walls are two toned I found most pictures make it look too busy

also the table isn't mine. I'm just storing it for someone right now until they can pick it up. can you suggest a color I can use to go with the room or show me some ideas?

I would do a black and white picture or painting, very graphic that is large enough to balance your cabinet. You might consider a round table once your friend picks up their table. Depending on the dimensions of the room it would be a nice contrast to all of the straight angles in the room.