Hopefully the lovely folks here will give you some inspiration. However, they’ll need more photos of the entire room. Also, post a floor plan with readable measurements including doors and windows, etc. It’d be helpful to hear more of your style and what exactly you mean by “library.”

I have been dealing with my Dad and Mom's stuff they have accumulated over the years. They both kept and bought LOTS of things that should never have been accumulated. I also have that tendency...I can't help it, it's in my genes!

It looks like you might have children and that's always a difficult situation to be organized and tidy in. Bottom line though, looks like you need to act like you are about to move to a new home and donate, sell, throw out anything you don't really need. There is no way anyone can be organized and tidy if there are not enough empty spaces to put away the things you do use regularly. Now for the library look! I agree with the comment above, folks may need to see your floor plan before they can recommend where and how to put book storage/display areas. Without being able to see the rest of your available spaces, I would look for a wall that is long enough, or short enough (depending on how much shelf space you want/need) to convert into full length shelves. If it's done nicely with the proper trim and a quality wood, you can install shelving fully along one wall and that can be your library. If you have a smallish room and lots of books you actually need to keep, do shelves on all or three of the walls. Be sure to make at least some shelves adjustable for extra short or tall books.

That was very general. I don't see any walls in your photo that look conducive for my concept. If that is where you want your books, consider a free-standing, quality book shelf that will hold all of your books, or buy/build matching bookshelves that are taller than the ones you currently have. Yours look too small for your high ceilings.

Random thoughts:

- Do you have any library inspiration photographs? Personally, the first thing that comes to my mind is a Hogwarts library type look, but you may be thinking of something altogether different when you say "library".

- Do you want it to be functional (meaning, lots of actual books) or are you going for a book-look /a book-vibe only? I personally no longer have a lot of books ... I'm a dedicated Kindle reader, and I love holding several thousand books in one hand. I've heard it said, Buying /collecting books is one hobby. Reading is a different hobby.

- The room doesn't look all that big, and bookshelves on all the walls will shrink the room about a foot on each side.

- If you're going with real bookshelves, consider whether your foundation can support the weight of the books. You might need to reinforce the flooring. I say that because I grew up in a house with a wide hallway /bookshelves on both sides, and my father did reinforce our floor.

- I personally would consider closed cabinets under shelves (even though that's less library) because it'd allow you to hide kids' toys, board games, etc.

- Would you consider book wallpaper?

- I'm focusing on books, but do you want any other library functions? A table for reading or crafting? A card catalog?

Throwing out a couple pictures myself ... I like this! Honestly, it's all about that great window, but you have a single window. The ladder is a must. So much for my Hogwarts idea.

But I find this to be "too much" for a home. You need furniture.

Consider building shelves around that single window /making it into a window seat. Magical!

I like this for its color and for the closed storage underneath. I've seen instructions online for creating this type of thing from inexpensive Ikea shelving.

Why have you posted the same room saying it has to look like a teen room?I need to make this look like a teens room

Since we only have one picture of the room and not much information as to budget or furniture you'll be using, this is only a concept showing ready made bookcases from Ikea.