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.