I didn't even realize there was a windmill in the challenge entry - definitely would have preferred the lesser saturated colors - but even then, I don't feel like the photo would have had the impact you wanted. Silhouette shots are hard like that.
I have to agree that the colors are just too over the top. The weather vane is completely consumed by them, whereas in the original there was a nice, sharp subject that stood out against an interesting sky. I think this is one of those times that, though it was there for the taking, less is more.