The fog quality is at the default setting. It looks really good to me without the jpeg compression. I plan on increasing it for the final render.
I thought I would add some dry bushes (the greener ones, I don't have many others except Mr. Lamppost's. They render too bright, but I don't want to change them.)
Other than that, I am stuck. I am keeping Dune's suggestion from another thread, that less is more.
Some medieval tents perhaps? It looks like a likely place for a tournament.