Well I think you could bring out the details in the texture some. I don't know if its the texture filter doing it, or the texture was maybe painted that way, maybe an adjustment in the render settings would help. Its the contrast, everything is kinda green and blurry. The castle room doesn't sound like a bad idea, you could Zbrush the hell outta those walls lol :p and let me know if the sky thing works out.


P.S

Also I noticed you made the neck considerably thinner, looks like it would snap under the weight of that head.