A heavenly dream castle, surrounded by clouds and a halo of light, a tremendously beautiful, majestic, dazzling sight,Cloud World, angels flying around, majestic gates and pillars, the sun and moon and stars, in heaven, 
masterpiece, best quality, ultra-detailed, 
Sidon, Sidon style
(photorealistic), an extremely delicate and beautiful, depth of field, film grain, professional lighting, 
photon mapping, radiosity, physically-based rendering,
A painting of a castle in the sky with a boat in the water