Dirt, you handled the exposure for the whites very well and the sharpness is perfect
Some thoughts:
I do think a bit softer light would have suited my taste a bit better, but I'm very demanding when it comes to the quality of light!
The right side of the background works great, but the left side tend to compete a bit with your subject.
The out of focus foliage in the foreground could have been moved out of the way prior to shooting so it wouldn't have obscured the second flower.
A vertical presentation with more space below the flower and less space on the sides would have worked very well here.
I
really like the inclusion of the bud. For classical floral images having both bud and opened flower in the image is a big plus
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