Book shelves are often seen super-staged, in a way that I feel is a bit contrived. Instead of fake plants and fake books, please use real, live and authentic books, plants and art. Leave at least half of the shelves “open” to show room for more. In the open areas, a few decorative items are good. The key here is neatness (organize books by size) and balance (place some horizontally and others vertically.) The entire shelf should look functional and pleasing, not prop-like.