I like the tree, that works really well, have to agree the background does look flat in comparison. On a bright moon lit night the whole scene should catch the light, just not as much as the tree. could you isolate the background & adjust the levels a bit? Don't know if that would do it or not... The colour is good, makes it really eerie.

elusive.chaos

"You need chaos in your soul to give birth to a dancing star...." (Nietzsche)