The first thing that pops out to me is the balance of the image. Well compositioned. I also like how the petals are only visible. I however would have liked to seen a little less negative space allowing for more detail in the flower and a larger flower. The black background seems to make the long hard shaped petals seems jagged and a bit coarse. The darks in the petals ate nicely balanced and not to dark to get lost witht he background. I would have liked to seen a little larger water drops. I know that may not have been possible but critiquing can be a "wish list" of stuff. Took a very ordinary subject and with nice lighting and nice tones made a drmamtic peice. I do not know what would have helped your score. I think flowers and the like have only a certain obtainable score.
Wow! That is REALLY well done! And it takes a LOT to impress me with a flower photo. The light and shadows against that black background are so striking. It looks very 3-dimensional and floating.