Here are the basic ideas for my Environment Concept designs.
My idea for the mouth is to have a center piece, either a central nervous system or blood vessel. This would be under construction/destruction. The surrounding areas would be recognizable. Large teeth etc with scaffolding around them. There would be marks of general wear and tear. Tire marks etc.
This thumbnail is very straight forward. Everything will be very dark except the blinding light coming from the hallway when her parents are talking to her. However I think there could be a better composition within this design.