WOW peter...wow...wow. This is a simply superb shot. Maybe the flower's petals are a bit over exposed. Since they are white, they have reflected more light than the surroundings. I think, spot metering, would have been a better option. Just an opinion, I could be wrong too. :)
nice white, i like the way a little overexposure renders the white such a contrast to the coloured background. its enhanced by the little blue center of the flower...