I had a look at this tutorial Jeff Huang and then did this in my own way. I didn't like his outcome that much so i changed up quiet a few things for example, i burnt certain parts of the castle and the the stock background to add more depth. Used a different texture on the castle to make it look more torn down, changed up the bridge (removed some of the crap). And added a more subtle tone :)
Original Tut:
Digital Arts - Features - Build a fantasy castle
My outcome.
What do u think of my outcome? :)