i think this was a great idea for this challenge. the primary issue i see is that you don't really focus on any one particular shape for the viewer to lock onto. the center fence posts and rails have strong shapes, particularly in silhouette, and it might be more effective to crop into that area.
the reflection in the puddle is also nice, but it presents another shape in the photo that compromises the viewer's focus.
i think using the color in the lower left of the sky would also help beautify the shot as well. everyone likes cool sky colors.
This photo looked odd at first. It is nice but the darkness made it hard to see everything. The subject is a good one but the gate is lost in the ground. Some fill flash might help this but may cause a hot spot.