Nice work on the clouds and shading the light on those curved walls! This whole thing feels very cohesive, all the pieces fit together really nicely.

As a prompt, though, it's not suggesting a whole lot to me. Castle in the clouds, something about a mirage... I dunno. I'd like to see the castle itself suggest more. What's its story? How'd it get up there, or what happened to leave it so empty?

Good work, but it's a bit on the simple side, I think?

This is a very nice rendition. The crenellations are well done, if not 100% consistent around the top levels. You did the whispyness of the clouds very well too.

Looks like an actual castle in actual clouds. Some more blue below would help to sell the idea that it’s a castle in the sky; otherwise it could be a regular castle in a fogbank.