What arrangement and scale of art looks best?

I’m looking for some advice! This space between the sconces over our dining table needs art, and I can’t decide what looks best. Is there a particular scale, number of pieces, or arrangement that makes the most sense here?

Ignore the frames and art. These are just examples for size and layout. I used whatever I could find in the Shuffles app. I’m not looking for advice on the art itself (not yet anyway).

More context: a larger table is coming and will be centered with the sconces. This area is part of a larger room with super high ceilings. There’s a large mirror above the fireplace on the opposite wall. There will also be a gallery wall above a staircase to the right of the dining area. Not sure if any of this makes a difference, but it might!