Hi,
I think the image's strength is in the mood, as everyone else has said, but also in the composition and ground colors. Two things look wrong to me:
1 - I think the grassy ground should extend to the tree line. The trees shouldn't be standing in water. It looks wrong to me. Not a major letdown, tough.
2 - The clouds. I don't think they are good enough for this otherwise quite perfect image. Somehow, they look stained and exploded. I think less defined, larger but thin and wispy clouds would fit this better.
Notwithstanding all critics... this is one of your highlight-renders for sure.
Best regards,
Frank