mmm - A flower shot - very dificult to get scores UNLESS you have a realy exceptional shot. This is due to the the thousands of shot out there.
I think the fact that you did not have enough yellow in the shot had a big influence on the voting. A closer crop or an extra yellow flower would've helped.
I ilke the DOF in this shot. That you did good.
Image seems a bit soft - One thing to remember on challenges at DPC is that the voters love Clear,crisp,sharp colourful images.
I would have liked to see a litle more DOF to bring the whole flower in focus or at least the all of the one petal. I like the hint of the other flower on the right side and the very blured background.
Maybe a difference angle to accentuate the yellow more would help; as it stands the yellow is too insignificant in this picture (IMHO) to really be considered complementary
3 - Nice concept. For this Challenge especially though, a much tighter crop, eliminating the green, also the iris looks either wilted, or this angle is not capturing its uniqueness, not sure.