It's massive! This begins to approach a scale that Minas Tirith would need to be on. There is great detail, such as the dragon head coming out the cave mouth.
But I can't help to be under-awed. Aside from the amount of grey, nothing really reaches out and grabs me. There is too little (aside from the ring of flowers at the base) that looks organic. There's a heavy sort of industrial feel. It's like someone built a castle-ish building covering two city blocks. It feels more like a Medieval Times restaurant/facility than a castle. There's not enough rounded off, no towers that catch the eye (and the imagination), flags, fountains and so on.
Dave I hope this post isn't taken to heart. I don't want you to take this as negative or some kind of attack. Indeed, I marvel at the size and scope. I love the decorated floor of the courtyard and such touches. I also like the continuity you carry throughout evidenced best by the dark gray window detail. I hope to be able to build so big some time.
Men who lie, merely hide the truth; but men who tell half-lies, have forgotten where they put it--Samuel Clemens