I happen to like the dark trees as the give weight and stability to the image, and give focus to the mountain. Without the dark trees the viewers attention would shift to the foreground which while interesting in of its self, is not IMHO the main focal point of the image.
If any one here is familiar with the photographic work of August Sander, by way of example, you will see that the side of his photographs he wanted least dominant are darker then that side which the viewer should be focused; this then is part of classical art theory and is easy to understand!
Regards to you.
Cyber-Angel