My first thought was similar . . . that the greens were too intense. But then I recalled my own hike this past weekend, and the early foliage this time of year has more intense greens than the mature leaves in mid-summer. This may actually reflect some of those "younger" green leaves . . .
I do like the shots, though. I always try to remember that depending on your audience, some will like certain techniques, other will not. This shot reminds me of the motivational posters you often see, especially in the inflight magazines. Large black borders with some philosophical phrase like PERSISTANCE under the shot . . .