Camera Work/Technical: Nice focus. Your bloom detail turned out nice and crisp. I would like to see a more shallow depth of field. Opening up that aperture would really make the bloom jump off or a blurred background.
Lighting: I like the time of day you chose to shoot this, as it did a fine job separating your background and foreground. You did lose a little detail on some of the bloom petals with some slight overexposure.
Composition/Content: I am not too fond of the centered composition for his particular image. I think opening up the crop a bit and shift you position to one side would have greatly improved the composition.
My Opinion: I think it met the challenge just fine. I am not familiar with many of the Beatles' songs, so your title helped out.