The chair themselves are fine as it is. It’s just me and being a perfectionist.
The stands for it are a tad bit too small.
It would look better if the sides on the top of the chair are slightly curved.
The color, try to play with it and try to have it matched the grill, maybe beige or white or black (around that region).
The sides too for the bottom could be a tad bit curved.
Over all, just play around with it and try to imagine different variations and how it would look in real life. IT looks very good and I can’t wait to see what you do