I would guess that depends on how high you hang the art

Get a piece of art that will reach the top of the curved window if hung with 8 " between the mantle and the bottom edge of the art. You can add three candlesticks on one side and a large piece of art glass on the other side. If these items are in front of any part of the art, no problem that makes it more interesting. The art should be about as wide as the outside portion of the white fireplace side edges.