A wall of books is totally all the color a room needs when you get down to it. (Not that I'm justifying my book-habit, not one bit. Denial exists for a reason.)

Apart from the rug and chair it does have a kind of temporary, thrown-together feeling to me. Which could be a good thing, in that super cool+ casual, not overly fussy or contrived way. But I think that that the bare wood furniture outside a super modern setting, plus the lack of window dressings makes it feel just a little bit too spartan and unfinished, despite the abundance of interesting objects and personality in those objects.

Your room is very real and very warm. It looks like a lot of creativity happens here. Love your basket of yarn. Nice. :)