You could change the position of Batman, beacause the light of the moon, is going to onde side, anda the light in Batman is in the other side, that's confuse. 
if that darker blue were a bit darker, it would function better as a buffer between the light blue and the black
you could also use those blues to aa the outline of the moon
i'm sorry that i'm not level two yet, if I was i had voted
the light that shines from behind is not strictly in the light of the moon, may be another focus.