Maybe you could view the cathedral a little more under an angle. A bit more to the left maybe. It might help to get some more perspective and an even better sence of scale. If you want to add a mysterious touch to it you could let lightbeams beam out of the windows and opened door(s). A bit like god himself actually physically is inside the building. You could build the surrounding scene in a seperate br5 file and them merge before the final render for faster scene manipulation. But masking has it's advantages too. Which technique is best depends on how much and what kind of effectswork you want to add after rendering.

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