|*Hello from Sid and the Critique Club*
A knobbled attempt that I assume meets the challenge.
I say assume because the assumption is that this is your best art shot of the year and a very good one it was too, I also say was, because what you started with had enough potential and attraction to just tweak it in a minor way to get the very best quality out of it. Unfortunately what you have done in post processing is, for me, far too heavy handed it has destroyed most of the original quality that was surely there for perfecting.
I can see why you were tempted to take it too far you obviously wanted to get the best out of the lovely rainbow but to get it to this you have sacrificed everything else in the image. I don't want to labour the point anymore than I already have, I'll just say, sorry, the end result is just not for me, as you can see from one of your commenters who loves it we are not all the same, Sid.