There's also no distance haze effect; there's a single point source of light and no atmospheric scattering illuminating the shadows. Plus it's basically a single uniform gray texture with no variation other than the height.

It's like a video game with ALL the advanced techniques we use to make things look 'real' turned off, because most of those things are atmospheric effects, and this landscape lacks one.

Unrelated but happened today and found funny, my dad was telling me how my brother somewhere got this miniature 2 liter bottle of Coca-Cola. It was like a couple inches in size. It was sold as a joke product to put beside fish you caught to make them appear bigger in photos.