Here is my take for the contest with the Dark City.
In this not so near future, as earth is absolutely overpoluted, teh whole surface had been converted to a gigantic city. No one could see the sun anymore, because of the whole building thing but also the perpetual fog in the atmosphere.
Air and water are provided by enormous machines pumping the heat core of the planet to convert the energy, and this cause the orange light that people sees everywhere.
Here is the main artwork form the city, and we could see a flying ship cuting the overall ambiance. A traveler maybe, merchant probably, trading some valuable ressources from place to place.
And an animated version of the place:
Awesome music from Amoebacrew
Here is some other shots without overpainting and grading:
And the map used to create the city for those who knows the displacement technique:
Wish the best to everyone in this contest