Here's a render of that water plane with various fresnel toys added. There is a sky dome with blue sky and faint clouds. The ground is brown.

I positioned the light low and opposite to the camera. It is an infinite light. I also have an IBL for general illumination. Because the light is behind the props, most of the diffuse light you see, for example on the stairs, is from the IBL.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)