@spikeyxxx I would definitely use an HDRi to get realistic reflections (do you have screen space reflections turned on?), so maybe opening op the cube but use an interior one? And then a light through the staircase to simulate the moon like you already have and the orange light to simulate lamps works well too, so that’s good already 🙂
Maybe keep the hdri low to only get reflections and a little bit of ambient light, and using an additional area light or two (one blue and one orange) for the rest of ambient lighting, on which you then turn all shadow casting off so it only contributes to the lighting. Definitely use volumetrics and turn soft shadows on that will up the ambience a lot.
Just some thoughts 😉
