Clearly a lot of effort in making this, I'm guessing this wasn't made fore the challenge but that doesn't really matter. Love the overall scene, though a suspect the people are just a little on the small size and getting closer in may help.
Oddly, if the cows weren't there and you could have created the sense of a trail, this would be more to more liking. I say oddly, because the creativity of this shot is great.
:-) It took me a minute for my eyes to find the cows and little people. Your hillside/mountain has such a good texture, the people get a bit lost. Good lighting.