If you are having trouble getting the children to get into the library/book center. Try adding some really cool books. Also place a canopy. The one pictured is bought from an online place, but you can make your own with material that hangs from wooden rods.
They are easy to make with just some screws and some material and hot glue gun.
Also have a comfy chair or a bean bag chair. Try to put stuffed animals that the children can read to and have a little area carpet.
I love the posters I placed on my library center which are authors of children's books.