oh, you most definitely shouldn't have done this cheap selective desaturation (I prefer to call it selective destruction :)) trick - it would've been a great waldo shot forcing me to look hard. but now - where is the challenge? :)
Many people used B/W to hide Waldo. Your selective desaturation makes Waldo really stand out as well as the red flowers that would go unnoticed in B/W. Nice field shot.
Nice composition in terms of waldos head hitting a rule of third line and the desatting of waldo and the flower in the foregrond provide a great counterpoint to the field
Neat image with some nice touches, though completely disaturated except for the flowers would have appealed to me more, I think. I like the concept a lot, and composition is good (though moving Waldo down and in just a bit might have improved it for me just a tad, but would have thrown more focus on him), along with an almost abstract appearance because of your choice of location. Good shot.
I like how the vegetatin sets up a feeling of repeating patterns here that is broken nicely by the head. Not sure what the little red splatterings are, though.
The selective desat where you left the flowers orange is nice, but the head is a major distraction from the rest of the photo. I think Waldo is supposed to blend in, not stand out. It might have been cool to just see Waldo's eyes peering out from the heads of grain or something more subtle. Without knowing the challenge topic, I would wonder why the man's head is there and what it has to do with the rest of the photo.