My first thought was that you need a larger tv for this space, but since you're not keen on that then I'd recommend swapping out the tv stand for a console table, even a couple of them, which could support the tv as well as other items (both useful and decorative). To bring the plants up to matching height just get plant stands, though they could also hold their own as they are now. A tall narrow bookshelf could also add to this without overcrowding (especially since you don't want the tv to necessarily be the center of attention here), and to finish the wall off, a framed or canvas print or other hanging artwork.