I'm usually a paint fan, but you have a lot going on here already and the dark wood helps tie back to your dark leather. Definitely do not paint this white - it bisects the earth toned stone and will jump out to the eye in a non-pleasing way. You could go to a drabware tone from the stone but it would clash with your kitchen cabinets. So I think status quo and dealing with the shelves by filling them 1/3 open / 1/3 function (books, games) and 1/3 art (little statue, painting, plates or ceramics . . . best choice. If you can add lighting, even the battery powered kind that sits in the top and you push on and off manually, that in the very top of both sides would be good.
The thing I want to paint is all the too white white trim and french door that seem like they are too white for the floor and tan wall and earthy colors in the space. I would like to see the trim around the doorway to the closet hall and the doors at least painted one coat of a creamier off-white (not asking you to paint all the baseboards too though that would be best). An antique white shade like bm ivory porcelain could do a lot . . http://www.benjaminmoore.com/en-us/paint-color/ivoryporcelain
The wood tones you have work well together but not so great with the white white. I don't see mirrors working well with these rustic elements on the back of the shelves either. Drapery so it fills the wall area where the windows and doors are not is a terrific idea . . right now you need some softness and sound absorbtion.
And finally, for a room with elements like this, I think you've picked the right kind of wall tone that has warmth but doesn't try to make the room light filled - it just isn't so you make it cozy and warm and that is nice in its own way.
Q
problem with white trim and colored walls and dark mantle and beam
Q