Interesting composition, I like it. My own inclination would be to enhance the contrast with an S curve, but its a matter of taste. I agree with Bob that trying a different crop is worthwhile. You have a couple of nice diagonals in your image, from the leaf and drop to the bottom right, extended by the background leaf, and a subtle diagonal in the background center rising to the right. You might try cropping just to the right of the lower leaf, preserving a bit of the white on the lower right, echoing the frozen droplet. As balance, you might then crop a tad from the left.
1. The water droplet is overexposed. When I look at the histogram I see a large percentage of the water droplet is pure white (255 on the scale) and that shouldn't be the case. (I see this by holding down the alt-key and clicking on the marker on the right, which shows me all the parts of the image at the value of 255.
2. There's not enough seperation of the leaf from the background. The background is nicely blurred by unfortunately too similar in color to the main subject.
I did some tweaking in PS CS3 to try and gain seperation from the background. I cropped too because there seemed to be wasted space to the left.
