Returning for comment:
Great details and nice composition.
the pink and yellow don't go well together IMO, but it still fits the challenge nicely and I think you did a good job.
Very nice. Kudos for having the courage to have "Pink" as your backgound, not the subject. Hope other don't vote you down, because this is a beautiful image. Well done.
For me this is a photograph of a yellow flower and the background is secondary. Hope you don't think I'm being too fussy. The image is superb - love it.
To me, it is yellow and not pink, that is the main colour in this image, so it fails to meet the challenge. Otherwise, composition and technicals are good.
Nice shot of a yellow mum against the pink background. Unfortunately, the challenge was to make pink the focus of your shot. If this was a yellow challenge I would give you an 8, but since it is the pink challenge I will give you a 3.