I really love that photo! It has a really romantic and chic vibe about it that should suit the perfume aesthetic. It's quite an awkward pose for Leighton to hold with her arms forward and it isn't entirely flattering. I can agree that she's sort of falling out of favour compared to her status a few years ago. The male model is doing a really good job, not sure why but he's really cute and it's lovely detail within the shot.
For some reason I just don't like Leighton that much, everything else is gorgeous though - the colour of the dress is divine and I do love a bit of romance in fashion! Can't wait to smell the perfume now, ooh