Would have been so much better without the tree line, then you would have acheived TRUE minimalism....Webster: "a style or technique (as in music, literature, or design) that is characterized by extreme spareness and simplicity"
I like the gradient in the sky, but I would have preferred this without the moon. I'm sure it looked very nice in person, but the moon always looks very small in photographs unless it's the only thing in the photo (Google for "moon illusion" for information on why).
Beautiful colors in this. Having so much of the trees at the bottom distracts a bit from the moon (which I wish were in better focus). Perhaps try this with a little different crop, say, oh, about an inch or so off the bottom. Just my opinion, but I think that would have bumped it up a couple of points.
This is a nice image. I really like the coloring in this image. I also like the placement of the moon and how small it looks from where the image was taken. Nice work.