This is a very cool back-story and scene, complex and well composed. I really love the POV and you have some wonderful details here. There's a little bit of weirdness going on in the lower right. I think it may be cliff side and castle poking through each other. I really do think you've a done a wonderful job with this and the time and effort are quite apparent although I can't help but think you might be better served by an environmental type render program like Bryce which would provide better textures for rocks, water, fog, etc as well as environmental lighting. Still, excellent work by any standard.