I've shaped, sized and added the buttresses. The building still doesn't look quite as I would like. I'm off to do some research of remote stone castles and monasteries. I also need to start seriously thinking about my Matte painting. I want (ambitious as it may seem at this stage) to have a final view not dissimilar to the angle above. My matte painting will form the background. I propose to paint in an electrical storm with the light of the storm being the primary light source. With a nicely toned black/blue blinn I believe I can create a surface that should react well with the light source and strike that cord of weird believability.
To the internet to find stonework and lightning,