They blend in with the background too much. So many elements are the same in both your subject and the background. Things like the red flowers and the red splotches, the white flowers and the white splotches, the bokehlights and the babies breath. And they are all relatively the same size to boot! The greenery is dark, and so is your background.
See how much sameness is in the two? Squint at it, and tell me you can distinctly see the subject.
Find a simpler background and try again. It would be more successful if you only had one element in common between the two, like bokehdots and the babies breath.