Sky Castle by IO4 ()
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Having a little play around using cloud brushes and backgrounds, which I've never done before. The castle and base was rendered in Bryce with plain background, and then clouds added using a photographic cloud background, cloud brushes, and lots of layering and texturing in Photoshop.
Shroom Castle, and a background from Dark Mythical skies from Daz.
Cloud brushes by Antje from the freebie section here at Rendro.