I happen to think that colors in this photo are completely "missing a target".
Interesting. I like this muted pair of complimentary violets and green/gold, which strike me as very rich. Perhaps it speaks especially to me now in autumn, even though iris typically bloom in spring.
I also enjoy the bokeh, backlight and detail in the forward flower.
In terms of composition, it is the other three flowers which give me difficulty but I can't define why. There is a repetition of shapes between pairs 1/3 and 2/4. But I think I wish the leftmost bud wasn't there. Without that, then I start to see a story of "unfurling" in the light.