Hi again,
i'm assuming this is also newly painted? You know, I don't really understand the decorative trim on the walls. Since you're more into modern furniture, I'd be tempted to remove the trim and smooth the walls out.

Is this open to the living room and kitchen? In which case you need to take into consideration the furniture and cabinet colour that's in those spaces. Here's an ideabook about choosing the right size table for a dining room;
https://www.houzz.com/magazine/how-to-seat-your-dinner-guests-in-comfort-stsetivw-vs~4841431

follow the link under the picture

I went to the place where you got the sectional and they do perhaps have dining tables and chairs that will fit your style and the rest of the space. I liked these two for example. Seem to fit the style of the sectional, square shapes.