well hey I like it
sure those trees don't look natural, but that's it- they are the first things that caught my attention, and the eerie shape is complimented by the monochrome color scheme.
I was put off a bit by the lack of features on the landscape behind the trees, but I feel you made a good choice of keeping it that way; otherwise it would be too busy of a background, and it would rob the attention away from the center.
Intentionally or not, this piece has a really appealing format based off the "path" you had drawn. Simply put, the path leads viewers' eyes straight to the mountain, to the tiny cave like opening you added. Plus, the trees frame the path, they fence it- they too add to the effecting of drawing attention to the focal point.
Of the mountains in the background, there is room to add better texture- especially with charcoal. Additionally, they seem to blend together rather than stand apart.
well like I said, I like it