lmao owned

but it has a human breathable atmosphere so the clear sky should still be pretty dang blue.

should we expect it to look exactly like earth

no, and I'm not saying we should. I'm saying that a harsh desert setting still leaves a lot of room for visual dynamism, and that Lawrence of Arabia does a good job of showing that.

It makes sense that the developed areas of Arrakis be near the spice sands, which should be vast expanse of dunes. But the exposed rock of desert is often quite beautiful and I'm looking forward to seeing it, as those places are where the Fremen settlements are.

Go look up some stills from (or watch) Lawrence of Arabia. There's a lot of visual range even in a desert!