The flower isn't very clear, it may be slightly out of focus. It may have been better to fill the frame more with the flower. The leaves seem to overpower it a bit.
I like this one, idea and the colours. Although the pink flower could be a bit sharper and the leaves a bit blurrer. I wouldn't have centered it, I would have composed it using the rules of thirds.
too centralised, colour too dull and not contrasting enough could be due to the inappropriate time and lighting condition that this shot was taken. kills off any grace this flower ought to portray.
Way too much green. I would have cropped this in a way to fit the rule of thirds. I really don't think that putting the subject in the middle is very effective. I really enjoy the color of the flower though.