Environment Concept Art

My concept art hasn't got much colour nor detail to it but it gives me and the viewer a clear idea of what i'm going for. The textures i'm wanting to incorporate are simple solid rough rock with moss and other residue around and the scaling may change towards the final idea of the environment, depending on how it looks on a 3D world.
I had a think about how the enchanted forest would fit into a floating rock and how the game player would know that their environment was floating. The answer to this is they wouldn't be able to tell as they would be a small person in a big environment, kind of like an average human cannot tell that the earth is floating. So there fore to give the illusion that the place is floating is just by placing the other rocks directly above and around the main environment.
the concept art below shows the stage i'm at: