To me the carpet is all wrong. To insert "brown" for the sake of inserting brown is missing the point. You also have no pattern in the space at all. I would replace the rug with a different one that has a pattern using the colors, gray, brown, black, white, and red. On the wall in the dining area with the thin clock, remove the clock and place a large painting, print, something that can hang vertically, it should be colorful and need not use only the colors mentioned for the rug, it could have yellows and greens and blues. Too much of the same colors used over and over becomes dull. Art should be chosen because you like it..not to match the decor. As for a white coffee table, I would suggest stainless & glass, white is to stark against all the dark of this portion of the space. Patterned multi color pillows for the sofa. Your kitchen is fantastic. Love the art on the wall.