I think it's a very good piece of conceptual art, and certainly worthy. I feel that if the background and its texture were blurred and darkened, it might give a greater sense of perspective and atmosphere.
Hm, I think the problem about the detailing here is that you used kinda random brushstrokes and textures. Details and Textures are there to give more focus on important parts and can help to make the form more readable. On the big tree it doesn't really look for me like your strokes are following the flow of the bark. Maybe take a look at some photos to see how you can achieve a look that feels more like what you want? And maybe try to go deeper into the topic of values as well. You loose some depth because the trees (?) in the background are nearly as dark as the foreground. If you keep them lighter, your main center of interest will be much more in focus