Too many tiny little items on a big bookcase. Group your collections on one shelf, like all the frames on one shelf, all the little pots on one shelf. But really, you need larger things. Coffee table books are great- stack 4 or 5 books on 3 or 4 random shelves. The top two shelves look fine. That leaves the bottom table shelf on each side. Do you have a pair of something larger that will fill those spaces, one one each side?

Maybe one or two real plants. Books would be nice. A big vase. Not every space needs something.