I love the idea of a dedicated library space. If this one were *mine, it would take me the rest of my life to fill all of those shelves with books but I the room itself would hardly need a thing. It's so pretty already. So, I think I'd keep it simple with a yellow tufted couch, a vintage sign and rug, brown and cream canopy striped curtains and rather than a formal portrait above the fireplace as is typical in a library, this stately bird instead.
*I'd love to know how you'd choose to make it yours if you'd like to play along! Location Works