Nice work so far! I think the biggest problem right now is the lighting. It's very frontal and high in the sky, giving the whole scene a flat, washed-out look. Bring the sun around to act as more of a back light or side light. Second, your leaf shaders need some work. Right now, every leaf on each tree is the exact same color, and many of your trees in the background are the exact same (and overly saturated, I think). They will need some translucency too, especially when you adjust the lighting. Third, the scale is still wrong. Your road looks like a 5 foot wide path because of the scale of the grass and dandelions.