First shot is ok, but though the big dark shadow has that sort of 'serene' look to it allowing you to focus further down the valley, it just looks like a poor shot.
The shot that you used to take the shadow out, it just doesn't look natural to me for some reason. A photo should be almost just as you saw it in reallife imo. The foreground in the 2nd picture is kinda saturated in a way that it looks like post-editing. Naturally things in the foreground will look saturated or hazy, but not like that.
Think about the subject when you are taking landscape shots. The canyons are tall and so are the trees. A vertical shot would suit this photo a lot more, because you could capture more sky. (Best to have more blue sky showing through (or sky in general with low cloud count). If you still want a normal portrait style photo, and want to show more of the canyon, I suggest a fisheye lense of some kind, with a polarizer or some filter to darken the shades up and give more rich feel.