Fantastic shot, I agree with all the above compliments. However, seeing as you asked for it, here's the best I can muster as criticism!
There's comething not quite right about the crop - its tight at the bottom and sides but leaves space at the top. The squarer crop in the second shot works better I reckon.
Seeing as its a very 'formal' shot, I would be tempted to clone out the bit of green between the second and third petals from the right, the two bits of dust on the left hand petals, the bit of dirt on the stem and the couple of tiny strands of cobweb.
Also, a shot in a few days when some more of the 'buds' have opened up around the edges might look even better.
Now how picky is that!