Sky City

Tried out new ways to do color and use 3D as base for illustrations.
I imagined it to be a world with actual planet surface not being inhabited much - instead there are cities on top of impossibly tall stone pillars.
Transportation between cities is mostly by aircraft or hot-air balloons. Aircraft can't land on every city, but they can drop supplies or parachute people in.
I took inspiration from the interwar era for the aircraft. It's a bi-plane but with closing canopy and retracting landing gear.