No sense of scale

Excellent texturing, normals, and polygon work. But there's no sense of scale. Is this a small hill, a dune, a Rockies-size mountain, or a 10x Everest size mountain? Heck, I thought this was the ocean at very first until I looked at the background. I see the rover, but I had to read the title to get it, and it still doesn't contribute to the sense of how big this things is supposed to be.