For me, if your image contained more of the man on the right, and nobody in the background (especially the man's head on top of the animal's head), I would have scored it higher. I like the natural lighting you captured.
I WAS JUST THERE! OH, I'm so jealous. I got back just before this challenge started so I couldn't use my images from Peru. Wonderful place though isn't it. And funny image. I'm glad you got the woman too.
Highlights are a bit bright, and the composition sufferes from the man standing behind the llama in the background. Shifting the entire composition to include the individual there on the right would be more pleasing to the eye. The bright sunshine is just a little too harsh.