Stunning art, but still something seemed wrong with it... ... then I got it: The shadow of the rock-pillar in the left lower corner seems to be a bit too long. I may be mistaken but, check the angel of the sunrays. Nevertheless, I would die to have just a fraction of your talent!
Oooooohhhhhh. Been looking for something like this! Got a good idea for a city in D&D, and I was having a hard time depicting it from the outside, but this is quite good just for the cliffs overlooking the sea!