Nice.
I'd say an interesting foreground subject, I.e. stump, snag, rock, person, animal would improve an image like this.
Maybe a graduated filter for the sky also.
2nd edit I very well done. Nice shot overall. From that vantage point I can't see much to add. Maybe use a graduated filter from the bottom right corner back up at an angle to reduce the shadows on the rocks just slightly. Say a +30 shadows & +10 white & +3 clarity? Bring it up just enough that the fade is reaching the top of the rocks.
I've also tried inserting something into the scene in the foreground to balance it a little. Maybe a log or leaves on the water lower left. Doesn't help this one, but maybe next time?