That is a beautiful scene and render! The cliffside and foliage is very well done and the castle model 'sits' very naturally into the landscape. The POV is majestic and creates a nice sense of 'grand' scale. Sometimes I think there is 'mathematic' scale and 'eyeball' scale, and the difference can be disconcerting: if you viewed the castle from the ships POV I'm guessing the 'mathematic' scale would be 'true' and the 'eyeball' test would agree. From the high vantage point the scale of the ships is, to my eye, a problem. Especially if you focus on the large tower part of the upper castle while simultaneously viewing the ships in the water. It creates a sense of 'wrongness'. This is all very nit-picky, and by no means does it diminish the fine work in this image. The human optical capability coupled with the brains 'post-processing' and pattern recognition algorithms filters visual input in sometimes 'strange' ways. Scale can be tricky over large distances, especially when looking down into a deep canyon. Painters have historically 'fudged' the scale to 'please' the eye. I don't know how much more you intend to spend on this image, it really is quite nice as is, but some playing with the 'eyeball' might be an interesting experiment.
