Yet more dramatic lighting effects. What a handsome blue in the sky! The pine trees and the whiter streak (coming from the sun, is it? The moon?) form a set of almost-parallels, with the streaks of sky meeting them obliquely. There is a feeling of displacement (it's hard to tell what the angle of the clouds is, and the ground is not visible. This is poetic landscape; if you tried to humanize it, though (for instance, with a title like "Exhilaration" or some such), the impact would be lessened.