In Nasmiths art I don´t like the one of Harrenhal that much. It is like he is overdoing the gloomy part with the red sky. The buildings are ok, but the towers are perhaps a little to ruined. But apart from being bigger, i would think it would look more "normal" . It is not like it was build to be a ghost castle. And have an ethernal gloomy sky. I think the Red keep is a little to outlandish for me to. I always thought of it more in the lines if a more traditional medieval castle. But I could just be to boring and conservative. The eyrie is a little to shiny and pristine for something that has seen hard weather in the high mountains for centuries. I never thought of the dragontowers on dragonstone, in quite such a literal fashion. Something about the size of them, compared to the base of the castle also rubs me the wrong, without being able to say why. It does make more sense when Melisandre talks about waking a stone dragon, to have the towers being realistic livesize statues of dragons. But all my petty complaints are just that. Petty. These are fanstatic works of art. And i enjoyed looking at them. On a overall note they just seem a little to fairytale-ish, IMO for Martins gritty realism.