What you see here is a custom arena of the Living Forest made by me. I tried giving the background a dark and isolated look with black mountains and hanging skeletons to reveal a deadly and menacing look. Credits go to MKWarehouse for the sprites.
That's a good start of a concept, but I would not leave it at that. Continue working on it. Things that you should consider:
- Why would there be purple-colored stones in the middle of a forest without purple lightning? change the colors to match the rest of the background
- Maybe draw vines around the skeletons rather than chains. It is the LIVING forest after all.
- The brush (leaves) for the top of the trees are just pasted on the top randomly. I would actually make some branches if your trying to be convincing that what we see are leaves for the trees instead of up-side-down bushes.