Foliage

As the arena area is sand, there isn't going to be much Foliage.

As seen here, there is just a small amount of grass in loose sand of this type.

Which I have tried to emulate on the level by placing grass foliage in certain areas.

The foliage is part of the Infinity Blade Grasslands pack, and is being used currently as we have not created our own.

To add some extra embellishments, I have also began adding in some vines around the arena walls to show age, though not too many, as the environment is quite desert like, meaning not as many would grow in the hot climate.

Maybe this could suggest that it was at some point a more green place which became desert-like from some kind of disaster or natural phenomena.