You can use several objects of different sizes in a scene like a small poser-figure in front of a huge building to give a sense of scale. You can also use haze to give the scene a sense of depth. You can, for instance, let the haze play with the mountain in the background to let it look realy huge (it seems to me that that is one of the things you are trying to accomplish) you should also let the background mountain get more blurred (or you should get the front less burry), otherwise the mountain looks like it is much closer to the camera and that results in the collums losing their size.

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