This is an image of just bad timing and bad light. Not a lot of Photoshop work will help it. It's a nice location with a lot of potential. Sometime you just shoot it and come back later when the lighting is right. What do I mean about the lighting being right? The hot spot in the center of the leaves tells us that it was shot in the middle of the day with little to no cloud cover. It's bright with no contrast to give us a greener, more even look to it. Trust me, I have hundreds of these kinds of shots. I was recently up in New England and drove around on a nice sunny day, snapping my little heart out. I came home and deleted 90% of the images. I enjoyed taking them, but the light stunk and they were flat.
The Snake Tips
Thinking Critically about Photographs