It's really very nice. What I would do is take down the metal art work and instead do a floating shelf that holds your 3 vases (which are lovely). Don't make the shelf too high (make it little bit higher than the height of the black vase) and make the floating shelf as wide as the metal wall sculpture. So that becomes your new art work.
Then I would also take everything else off the sideboard and invest in some low boat trays and bowls. Then bring back your swirled couple.
Take everything off the table exept the runner (and you probably don't even need that). Bring out the placemats at mealtmes, and rectangular ones would fit the table better.