Composition looks good along with the exposure, I like the background a lot, no distracting highlights or shadows, keeps the drop isolated as it should be, nice job.
The only thing I dont like about the composition is that you have too much space at the bottom of the frame, its just empty space that does not really serve a purpose.
Lastly, the point of the nail is out focus and is a let down since its part of the focal point of the shot.
Cheers!,
Ccauceg