At first glance of your shot, I see an extremely well taken photo. "Jigsaw" is an excellent addition into the Square crop challenge. Even though you took a simple object you were able to make a piece that can stand above the rest. Normally 39th place might not be that great but when you are looking at a challenge that consist of 364 entries its is excellent.
The image itself is a wonderful piece. I think the lighting you used is the most striking piece. The way the light is able to capture the edges so delicately and enhance the depth of the texture on the leaves themselves. Also the composition is excellent, I don't think leaving the tips of the leaves on the top would have increased your score. The water droplets on the bottom are also nice and I do like the fact there are only three of them. Also I am torn as if I would have left the hole in the leaf or found another one if available, I don't think it would have hurt or better the score.