This grouping works because all the the frames are black & the subject matter doesn't have a lot of color either- also, the larger pieces are in the middle. I would have changed out that one brown mat though. Mats are fairly inexpensive to change- it's the framing that's costly. From Domino magazine
The white ceiling in this shot takes attention away from the focal point which is (hopefully) the seating and gathering place. If the grey were darker and the ceiling a mid-tone grey, this room would have more warmth and harmony.