You might consider also the space a round table has compared to a rectangular one. Usually, the round table of a 5 ft. diameter will not have a lot of room for 6 people to sit. It will be a little snug. Serving dishes will need to fit on the center of the table or off of the table. The rectangular table would offer more spacious seating for 6. Is it too large for your room? What are the dimensions of your dining room? (x ft. by y ft) As to your color palette, the contrast of black with other white furniture is interesting. Also, the green with the black and white could be quite unifying.

In that space you will only really have room for some seating and a DR table and chairs I would be looking fo a long low shallow unit for the media pieces and hang the T.V. on the wall 10.5 ' is very narrow. The room in these pics is almost exactly the same size as yours , if you see where the empty fireplace is that is where I would put your T.V. and then wap the bench for the sofa .

Great space, but narrow. How about the couch where the two chairs are, the storage piece under the artwork, and the two chairs in front of that light wall? If you need more seating, put the chairs across from the couch, and add another couch the same size at a right angle. Your area rug is a bit small. The wing chair should move away from the window, perhaps angled into the window/wall corner.

Painting the stairs and the wall behind them in contrasting colours will highlight how amazing the staircase is. Personally as a lover of books i would turn it into a reading nook.