Auf blender the door is 8 units high. The couple 5 units. That means etwa 2,2..2,4 meter high.
I made the whole thing in half an hour and rendered it for etwa 6 hours. So it's surely not perfect, but I had this idea and I wanted to see how it was after rendereing.
Yes. Peoples are 5 m. high and the door 8 meter. If you think that the peoples are 1.7. meter high, then the door will be 2.72 meter high (Not too much, indeed).
Hmm.. There's a lot of texture stretching and obvious repeating in the walls and floor.
If I'm honest, I don't see why you rendered it with Luxrender as I can't see any special feature that Blender internal wouldn't have been able to handle.
I think no matter what lux is going to track the light better, this is the essence of painting in some ways, the flow of light, you can't get that with blender, even if its reduced to a impressionistic mode, its the right light and dark masses.