great storyboard, Ulco! I wonder if you can add in more flowers in some scenes? just in a few places. For example, some dandelions would look great on the meadow of the last shot.
Also, here's one more suggestion: the paths look very straight, or in other words, their boundaries are too perfect. What about warping the blending mask for the paths a little bit. In case you have used real world scales for the scene, I would image that a warping fractal with 1m feature size, and 0.1 smallest size, displaced (for the warp) at 0.1m, could make the path look less straight, and add a little randomness.
Cheers,
Frank