a breadboard, a interesting tray or low large basket, something functional and decorative

I have a Chinese Export soup tureen that lives in the middle of my DR table. Took me years to find the right thing!

If you can get a big clunky old gothic style chandelier, or a nice old slipper shade fixture, your table wouldn't mind being naked--hang the new one a little bit lower. You dining set is very fabulous, you know. :)

My dining table alternates between a soup tureen, mine's not an antique though. It's my wedding pattern, Chinese Bouquet in rust. A silver art nouveau compote with matching candlesticks, a round crystal vase filled with flowers are also in heavy rotation. There are always candlesticks on the table, silver or crystal, sometimes pewter.

I think this room needs an appropriately sized and positioned sideboard. Once that's in place with art above it and it's curated, you won't notice that the dining table is bare. If it still bothers you a bowl of fruit or a vase of flowers atop a table runner would probably do the trick.

Contemporary Dining/Kitchen Area · More Info

Here's a mock-up with a side board and the art you like. I think it
shows that a bare table is negligible when other elements are
considered. Hopefully, it is helpful.

your table and chairs are too cool for words

whatever you choose next to them-should be worthy of them. Price doesn't matter; gorgeous fixtures and art can be found for cheap if one's lucky and knows where to look; personality does.

that's what I keep (whether we eat or not; obviously take off if a big party) on our dining table-a 2 by 3 embroidered wool runner, a wooden bowl with fruits, a colorful jar from Mexico, and flowers in a simple vase(flowers change of course). It sounds a lot, but it isn't. My table is simpler than yours though. So..I'd say just one thing, be it flowers or beautiful bowl (not wooden, in your case..porcelain or maybe metallic?)..or nothing, as Fori and Manon suggested-with a different lighting fixture, will be cool as is.