God, I was such a Martin fanboy. Back when I used to buy anything with that guy's name on it, this seemed like a great deal.
Some of the art is beautiful, and brilliantly paired with quotations from the novels but others...well. I think they were a third-a-book short come deadline, so they padded it with some hideous fan art. And I mean this is crayon stuff. Much of the good you've likely already seen too, either on dust jackets, promotional materials or in the trading card game.
I hear a new edition is coming out soon, so maybe those problems will be rectified - in the meantime, this book is a nice flip-through, but I ultimately let it go since it took up valuable shelf space.