1. Interior means a covered architectural space, not exposed directly to elements like wind and rain. Decorations are things added to the space for use by people. Occupied interior means Interior plus decorations.
2a. Only Photographs are allowed.
2b.The main subject must be the interior or this plus views through windows/doorways.
2c. Focus should include more than one decoration.
3a. Empty rooms, and abandoned places
3b. Special effects* that dominate or distract
3c. Places that are not personal* in some way like covered stadiums.