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is the castle itself could do with more detail, I feel it lets down the very high quality of the rest of the image.
cyphyr
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explain more please what does the castle need to have to make it more realistic

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I think maybe cypher was intimating that a bit more bump/displacement in the stone texture would help. I does wonders for the details adding small amounts of displacement. I dont think that that castle has a bump map, so if you take the colour map and turn it into a grayscale map and blur it a bit you'd have a really usable bump/displacement map...justload it into the bump/displacement channel of the default shader that I'm assuming the Multishader is using..I'd start with the shader set to 10 and go up/down from there according to your visual feedback. I really dig this image but do agree with cypher on this...but I'm a displacement maniac....LOL.. ...