Edited everything or whatever based on feedback.
Made them look rather hand drawn and cartoonish since it's a collection of people's (and mine) books, we are creation the library book by book also making it feel fantasy like with the cartoonish effect.
My sketch is of a book (The Hobbit, obviously) because my entire design is centered around it, made to appear like a hobbit hole (Bag End, Bilbo's house) with the round green door and the darker wood outside. My colour scheme was derived from that book also with the darker earthy colours. It will be artificially lit (good to read in but not too bright) as I want it to feel like a hobbit hole, tucked away from the world. Mixing real life with fantasy I guess.