The blurred petunias in the background seem fluid. Heavy from the night's storm, the petals droop and let the rain continue its decent to the earth.
Choosing a shallow depth of field blurred the close surroundings sufficiently, allowing for the sense of water all around, though pink. The morning light breaking through the clouds was bright enough to allow for adequate exposure without camera shake, giving the petunia's fibers a crisp sharp texture.
The contrast between sharp and soft, fluid and still makes for an interesting composition.