Nice composition! Great view from inside out!
I only understand a little about object making. Does each face (wall) of your room have a separate texture shader to be reflective or non reflective?
I ask because I really like the reflection on the floor, but I am not thrilled about the burst inside the room at the top and the bright circle flare inside. Does the extra planet do that circle inside because of burst, or is it an after effect?
I am not tearing your image apart, I am referencing it for possible views in future renders.