Just take a look at this shot with almost no clouds and perfect lighting:
And compare that to this 7/8 clouds, almost full overcast:
Or compare the cliffs on your bright day in WoP
to this picture of the real cliffs with extreme haze and no direct sun:
That's a difference like day and night - almost literally!
Just take a look at the blueish gras and tell me this looks realistic. It looks nice, yes, but it does NOT look realistic.