How about a narrow tree or tall, dried floral arrangement in the corner behind the chair? Maybe add pillows for your color. It may be just the angle of the photo, but the light fixture seems to too high and seems to be lost against the tile. It's interesting, but not as dramatic as the time. Maybe a more more substantial fixture would help tie it all together.

You could replace your table with a round turquoise, red, or orange leather ottoman. Or for just a bit of color, place a round, colorful tray on that table.

Yellow and gray really look pretty together and will lighten up the room. Make sure to add a cool yellow and not a warm one.

I would suggest adding some throw pillows on the chairs.