I like the border you chose but find that the scale of the border doesn't match the scale of the blocks. In other words, the applique in the border is too small. It just doesn't look right to me. I would pick some of the larger leaves from the blocks you have already done and use that size, even if it means you have to use less of them. You do have small leaves in some of the blocks, but the larger leaves and heavier flowers are what I focus on when I look at your quilt.
FYI....it is an absolutely beautiful quilt.