Let me explain my opinion in details:
You see the curved line on the bottom? It looks like... mmh... like a rudiment. There must be something below to show that it is because of some idea but not because of occasion.
Saying "1/3 to 2/3" you mean the horizon line I suppose? But where is the horizon? Why it is the line right behind the trees but not the mountains' highs line? I think you're too formal in this point.
To me, it would be proper to shift the view down by 10% and to make the sky darken a bit on left-top corner so that the cloud would have been better to see. This solution would resolve to problems:
1. first it will fill the vacuum in the corner
2. secondly, it would be a counterweight to the trees on the right. Very good counterweight because of similar forms of both the cloud and the trees.
Thank you very much for giving me more details, now I can understand what you mean.
For me the "horizon line" in this case is a kind of "virtual" and it's given by the first mountain line: with the trees=
the 1/3 and then the 2/3 are given by the second mountains line and also the sky.
If you look careffully in the sky, I leave some clouds on the left side, to equilibrate the wiew with the trees on the right side.
I think I was lucky to get these clouds, that give a kind of mirroring effect of the trees.
Despite what it seems, I have tried to calculate the composition of this picture.
But thank you, once again, to give me a constructive comment.
I do appreciate that.