Disliking the duplicated cacti. At least make a few diffrent styles of them or rotate them or something.
Maybe even put flowers on them.
A few more buildings would be good too. While this is background detail it makes the racetrack look alot more pretty. Red Raceway wouldnt have been as unique as it is if i just duped a few randomly selected builds about.
Also, suggestion- Behind the cacti there should be bricks that emmit the fog emmiter.