What rock...it is a copse of trees and I cannot image why it would be more spectacular when the sun was lower....to me, it is always more helpful to the critic to speak about that which is there rather than what one might speculate should've, could've or might of's. I have that shot and it did not light up the grasses as this one did, thus the title and the emphasis I chose to give to the image.
This is not presented as correct, only different.
I'm not sure exactly what you mean by your comment, (not about the sun's position), as you don't choose the emphasis by the title you give it. The emphasis is chosen by the way you present the image for the viewer to see, by understanding the viewers logic rather than trying to imprint your own via a title.
I like it and I like what you've done, the way you've caught the sun and the light on the grass. What I've done is as follows:
The crop is what I would call invisible structure, that is a rhythm and structure that the viewer is not meant to see or understand. It gives rhythm and harmony without being noticed. The main horizontal bands of light/mids/dark from top to bottom is roughly in the ratio of golden selection which I've echoed in the proportions of the frame, (a root5 rectangle which is a relative of golden selection (1.618:1) and is 2.236:1), this also works well with your central 'triangle' of light.
With colour I wouldn't try to push just one colour but let the sun 'bring the colour forth' by keeping the shadows more neutral. The overall orange tends to wash out some of the light, detail and natural colour. Don't be afraid of more neutral colour, though with more neutral colours you can push the vibrance if you desire.
I also used the healing brush to remove the ground in the bottom left.
Below is a more structured illustration of how the composition works. The shaded areas show the root5 rectangle and how it's really a golden ratio triptych, the circle shows it's construction. The crosses show how rebatement overlaps this very nicely. When you look at something you're always judging size and distance by relationships and distances. By using this hidden scale of distance and relating it to the proportions of the frame you can create a rhythm that sits quietly and un-noticed which can enhance static tranquility.