Hi Paul - well when you create a rendering, there is a kind of "virtual camera" that you can position wherever you want and the image is generated as if it was looking through that camera.

To make something look like a familiar size it would mostly involve placing that virtual camera to a relative location to the object that human eyeballs would most usually see it.

So for example don't place the camera 100,000 meters above the building, stuff like that.

- Michael