This is a good attempt at getting a rain drop photo, I have yet to try some of my own this spring. I do have a few comments that i would like to make, first it would be nice to know the settings that you used on your camera; like ISO, f/stop, and shutter speed.
you do have a very narrow depth of field, I would like to see more of the back leaves in focus.
it looks like you painted in the black back ground in photoshop after in post processing, is this correct? if you wanted a dark back ground you could try with a sheet or something when taking the photo. or using a flash with a Small aperture or high f/stop number would also create a darker background.
did you handhold this photo? if so I would recommenced a tripod to reduce camera shake which would also allow for smaller apertures and longer shutter speeds associated.
I do think adding the saturation and the contrast works for this photo but do remember to sharpen after resizing the photo for upload.
I might also move the rain drop closer to one of the intersection rather than so far down in the frame.