I stuck to the "hard edged brush" as I didn't dare venture away from the default selection. The leaf brush that came with the software probably wouldn't have fared particularly well as it appeared to be a Canadian maple tree leaf.
Critiques include: theres no differentiation between the leaves on the tree in the background or the ones closer to the front. The picture has no direct focal point at the end of the path. The front of the picture could use darkenning slightly.