Race, Ruins, and Radiopropulsive

Here is my entry for this month's gnomon contest: Hover Racer
Every year, people of all kind gather in this planet for the intergalactic hover race, the giants archs on the side are made of broken ships that crashes during the race.

And here is a quickie I've done to practice my brushwork:

 Hope you'll like it!

And for the bonus, here is something coooool: