If it were my dining room, would go with one big piece of art that is rectangular rather than square. Size would be at 75% of the length of the table. I would go colorful so the art is a focal point and get rid of the candles on the table. Right now, all your colors are soft and fade into the backgroud. And yes, your chandy is too high. Make the art bold. Art is personal though:) JMO.

I think at the very least the art s/b closer to one another - spreading it out doesn't give it more impact. One solution may be a silver framed mirror added between.

Your chandy mimics a row of candles now, I wouldn't repeat with more on table for everyday.

Use a floral arrangement, bowl or a grouping of vases/jars on table as a way to add color.

I would change the art to something with curves, not a straight-edge. Your chairs are rounded and the fixture is oval. So something to continue with that look.

I think your art looks ok but the two paintings are too far apart and the room is lacking color. Something bold would look a lot better imo.