A nice image; a couple of comments. It's at least one stop over-exposed, and the highlights on the blooms are almost blown. I suspect this was a result of matrix or wide-area metering being tricked by the large dark area behind the flower. In this case, spot metering a couple of points on the flower and averaging them (or using the daylight exposure rule) would have improved the exposure. Additionally, watch your backgrounds. In this case, the background is just focused enough to be distracting. A larger apeture would have created less DoF and thereore a softer, more pleasing background.
Just my $00.02 worth - your milage may vary.
~John
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