needs more contrast.
if this is meant to be an island that looks like a man/ has a man's face (rather than a man with a tree on his head, rising with his shoulders above the surface of the water), then i'd omit the part of the head that curves under, so that the island slopes up a bit to meet the head structure (not so much that it necessarily looks like a blob). would be a bit more subtle, but if this is in fact a man with a tree on his head then you wouldn't want subtle.