What an interesting though subtle twist on the floating island scene! (is the centrepiece floating? It can only be assumed.) We have the almost steampunk airships converging on a city which has simple skyscrapers surrounded by smaller buildings which in turn are surrounded by a lush green forest..
Well, the race track takes place in the sky, somewhere about between 10,000-30,000 feet in altitude and somewhere in a nice, bright yet Beautiful landscape like your art piece here With Mountains, a grassy green ground, lovely clouds, and some rivers or streams below