This is a very good and "complete" photo. The DoF you've used here is great because the blur doesn't bother me at all and in fact leads my eye into the middle ground and the leaf. Both the ground and leaf have great texture and character. I can imagine how the leaf has fallen into the shallows of a small mountain stream: very relaxing.
Very well taken photo. Personally im not a fan of the brown shades in this shot, but that is not something that is in your control as it is a personal preference. Id agree with the depth of focus comment above. Its good. There is also awesome detail in the pebbles on the side. Very good eye for compostion on this one.
"A piece of toast with butter always lands butter side down, and a cat always lands on its feet. What happens if a piece of toast is tied butter side down to the back of falling cat? Does it hover above the ground in perpetual indecision?"
I like the brown and green together. The textures in this shot make for an interesting background. I also like how the leaf isn't centered as the main subject. It lets the sand satnd out in it's own right. Nice work.