Maybe real ambience can help too. It has radiositiy-like capabilities wich can add more depth to objects in the shadow. The whole room is now in the shadow wich means that all the objects are lit by ambient light. Basic ambient light reduces all the detail and creates a lack of depth. You should add some lights inside the room. Diffuse light creates the depth you see in other scenes. Some tweaking of the textures might be needed to make the lighting look convincing.

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