What's with the griffon-type-thing?! The blurring is necessary, yes, but I don't think you did it properly.... Yes, with a city of THAT SIZE, the blurring should be much more pronounced. Either that, or take the shot from the back of the griffon. Also, either the seas are insanely high or those clouds are far too close to the sea. Clouds don't usually go that far down, especially with gigantic floating cities on them. Otherwise, your composition is an epic win. The city, in particular, is incredibly detailed and well drawn.
No, bad brain, stop having Bespin flashbacks. Really, this is awesome. The sunrise in the background was an excellent choice. Kind of reminds me fo that floating city from Stargate SG-1 when they met the Nox. I like how you have the pillars peaking throughthe clouds. It really makes me wonder whant their attached to. It makes me want to stare aat it longer to see if I can find out. The gryphon in the foreground is a nice touch, although I think it could be even better if you had an adventurer riding the gryphon. The waves are a nice touch. It must have taken you a long time to get the light propegation of the light on the waves just right. It looks so real I can almost hear the waves.
Amazing, you have my dream job...commissioned work for Wizards. Any way, you did an excellent job of directing the viewer's focus and the fantasy conceptualization is believable to the lore it is derived from.