If you want them to "fall" and flutter down the quilt, I would tilt the block. Recut the edges ( it looks like there is a border on each block ) so the leaves are no longer strait little soldiers marching in file. Tilt them in different directions (some left some right) to give it a random look. I've done this with butterflies and it can be quite effective. Really gives the feeling of movement.
Beautiful work by the way. I love the blue background, it really gives the feeling of looking up in the sky. Please let us see the finished quilt.