This image was an entry for Carrara Monthly Challenge #30 at DAZ 3D (and ended up taking second place in the contest).
The flying robots were built from Carrara primitives and assorted other components. They were originally built for the image Exploring Rorschach, and also feature in Grunt Army.
Two surface replicators are used to construct the battle-damaged city, with randomly-placed walls and piles of rubble. One replicator is in front of the camera, the other is behind it; the rubble scape that it creates is visible reflected in the female character's glasses.