If your lens can do it, maybe stop down the aperture, that, or move the subject further away from the bookshelf. To me they are too much in focus and are distracting. For example: Right now your friend is lost in the books and I'm drawn instantly to look at "BLACK HOLE". I almost miss looking at him and can only focus on that red book.
You need to do something to pull the subject into "focus". Maybe a more interesting pose, a different color shirt, a rim light, just something to draw your focus to him. I would try to shoot this in portrait as well, your subject is only taking up like 1/6th of the image. If you really want to keep it in landscape, I'd at least crop out the top of the book shelf. And try to move him/you so the vertical shelf isn't jutting out of his head.
I quickly googled "library portrait" and found this image:
http://blog.bdocktorphotography.com.../06/Roe-Jan-Library-Community-Portrait-96.jpg
Maybe something more like this? It still clearly communicates he's a librarian or a book reader of some sort, but the person's face is the focus of the image.
Other than that, your lighting is pretty good, maybe slightly under exposed (but that is any easy fix) and maybe just a touch soft focus.
Also, remove the NES Zapper from the bookshelf next time. (Like I said, background is too distracting.)
I only have MS Paint to work with on this computer, but I'd much rather see it like this:
