There is no terrain, just objects and clouds. All objects are made by myself except
the little ships in line and the buildings inside the floating "greenhouses" (DAZ) and
the trees (free sample by Evermotion).
The "city" was made in 3ds max with multiple instances of Greeble, a free 3ds max plug in,
and then textured with diffuse-, alpha-, specular- and displacement maps.
It took quite a while until I got the glass shader right...
Postwork:
contrast, color grading, lens flare and chromatic abberation (again
)