You should add some racing track, much roads to drive on, nice designed buildings. Hills and mountains would be nice if you make any offroad vehicles, also lakes would be nice.
Its not bad but its to square to be on. Try making a race track or look at a photo if you don’t know what it looks like. Also try to add more detail to the outside of the map. Either then those good job!
Buildings/Apartaments around the city, mountains in the borders of the map. And some obstacles for example: a big ramp, and the other that i want to see in this game is falling from a plane, and you must do some tricks and fall in the water or in a safe/Secured site.