Errr...."quicky"...meaning no compositional idea but just to look see how...LOL! Anyway..in that image, no fog, low on haze, three layer of clouds (one cumulus) all in volumetric and their density and illumination played with. Took just about four minutes on a PIII 850 with 512 Meg SDRAM wit image size as shown here. Thanks Tradivoro :)