I have no advice at all but I enjoy playing with other peoples pics. Though I might have tried a grad filter. Or if the shutter was open long enough with a narrow aperture, I'd waggle my fingers in front of the top half of the lens.
Edit: I used LR5b though without any of the new features. Ideally, I'd prefer to work this kind of thing through Photoshop. wher it might look better depending how much time I spent.