I agree with @Boxerpal - love your space - your furniture pieces seem MCM era to me. I like the touches of yellow / gold / white throughout. Does that vintage pattern chevron afghan live on sofa? Yes, please! Love the circle lamp on console table. I agree the small Wedgewood pedestal dish doesn’t fit coffee table & the planter too. I mentally rearranged some pieces - more than what you asked I know but I do it in my own home a lot. It gives me a fresh perspective on my treasures. The 2 pretty white vases on console table - vintage I think. They would look great on console in dining area & show up much better - one on each end framing the art. There’s too much going on behind the sofa with them & lamp & also with the lovely collection in the china cabinet. Removing the vases makes items in cabinet grab the eye instead of stopping at the 2 tall vases which show up better on their own & with a wall behind them & the overhead lighting you have. On coffee table, leave the tray & place the gold ”balloon” dog that’s on TV console in the tray with the coasters & TV remote & something else that fits with dog figurine. The horse on dining console would be great on TV console against its black color & it would show up more too. I thought the balls of twine in covered jar would be great as centerpiece on dining table. The texture & colors would be nice with those great chairs.

Can you get another sidboard to match the one you have ? Can the coffee machine sit on that sideboard ? I would do 2 and add a marble counter to them both a bit deeper so you would then be able to remove the shelving and add some art to those walls and have room to store stuff.

The idea of a coffee table is to have folks sitting on the furniture have a place to put up feet or a cup or a plate. You could put several small tables in front of each of your sofas. Or you could put a decorative but useless table in the middle of the room. What are the circles with silver rims that look built into the carpeting?

It’s difficult to get a sense of that area and thought this article might help. A round wouldn’t be my choice; perhaps tape out to get a baseline of what width will work best. https://www.mokacoffeepot.com/what-shape-coffee-table-works-best-with-a-sectional/ Regarding the style, suggest a modern wood design (in a complementary stain to the other wood) and long enough for practicality and to balance the space/sectional. Consider adding a unique centrepiece (I’m a big fan of large, interesting bowls) and a few cushions to pull everything together. https://www.cb2.com/emira-52-oval-light-brown-oak-wood-coffee-table/s400595 https://www.cb2.com/arabella-sand-and-black-velvet-throw-pillow-with-down-alternative-insert-23x23/s666751