I could see something in the way of a triptych (three panels) over your sofa. For example https://www.houzz.com/photos/violet-storm-triptych-wall-art-contemporary-sydney-phvw-vp~27674751

Another triptych . . . https://www.icanvas.com/canvas-print/skylights-wac1342#3PC3-60x40

I would suggest a grouping. One large picture and a couple smaller coordinating pictures on each side, or possibly two tall glass candleholders. As you can see in the pic below, a grouping of six coordinating pictures would be great too. I would also put a grouping of three vases on top of the bookcase.

misc. · More Info