I do well with pink dry flies - a lot smaller than that though. I have a wee pattern that I fish in the #16 - 20 bracket:
I've always nurtured a theory that it has something to do with the way pink absorbs part of light spectrum and reflects other parts. Insects have evolved camouflage, light absorption plays a part in camouflage , and I can't help but wonder if that's why pink flies do well. It never works as well during the brighter part of the day - that's when the duns, olives and harelugs come into their own - but early doors and late evening, I do very well with my wee pinky.
Louis Mountbatten came up with a pink that he used to camouflage his destroyer fleet, and I believe the army use pink on vehicles in desert terrain, precisely because of its ability to absorb light. There might be something in it, but it's difficult to apply a fair test to gather quantifiable data on something like this. Anecdotally, at least for me, pink's a great fly colour when the sun is low.