Please understand that you need to show an ENTIRE room and some of your furnishings to get solid advice. The picture you provided is inadequate. Good design comes about when every piece relates to everything in a room--walls, floors, lighting, rugs, style. etc. Doing things piecemeal just winds up with a new Design Dilemma.

The wall color appears to be a very light blue and the floor appears to be gray. Echoing Beverly, you could stay neutral with the upholstery and add some color with an area rug. Here are a few rug options with a grey sofa and patterned skirted swivel chairs. Note that all the rugs have blue in them. The color is also repeated on the chairs. For curtains, simple linen curtains in a crisp white.

I like your big squash colored chair — looks very inviting and comfy! — so I would keep it and then add another interesting, comfy chair in some nice color and get a much larger rug that pulled together all the colors in an interesting way —- and I would get a much bigger lamp, plus the right pillows and art. (I think all these rugs come in big sizes, not sure) Or I might ditch the 3 chairs and keep the 2 reds and then get 2 of any of these (except the blue, which I would only keep if I was keeping the orange-y chair) But I would still get a bigger rug to define the space and bring everything into the center and a bigger lamp and figure out what art I wanted over the sofa. It could be something as simple as black and white line drawings framed in black. In general I think the sofa is too close to the wall and everything should come forward a bit to ”float” the conversation area more in space. Instead of a corner table + lamp, might be nice to try a floor lamp that arcs into the space.

Sorry, not sure why the picture didn't post. Here it is again. RL, I like the round pendant and the pleated one in your first set of suggestions. Is that a Nelson bubble pendant? Also, I should have given a few dimensional details. The table is 36" wide at the ends, 40" wide in the center. Ceiling height is 92".