Ok, some things were already said above.
But the I wonder why no one said it: It doesn't looks like night.
Tho give a night effect, I'll suggest you:
Change the fog to dark blue, a very dark one. Then use taller trees and moonlight to give the effect of light coming from across the leaves, it will surely look nice! ;D
And of course, use midnight lightning.
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PS:With a terrain like this one, I would consider you a beginner, not a newb ;P
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