Hi William, the desk seems rather small compared to the chair; the seat of a chair would normally be around 40 by 40 cm and that would make me estimate the top surface of the desk about 40 by 60 or 70 cm and that is not a lot for a writing desk…
(A propos writing desk??? In a library??? Well, it’s your artwork, so make what you like, of course!!!)
Also you’ll probably need more than one book in a library, a lot more than this even:

(Sorry, I was just trying out how I would make many books in a relatively easy way…)