This was taken somewhere along Arizona Highway 89.
PP :
1) bump up a little bit of the saturation in the photo
2) create new layer, channel mixer.
3) set the monochrome option, then tweak the red / green / blue to taste. bump the contrast up a little bit.
4) USM : 225% / .5 pixels / 0 levels
5) save, then a heavy run through helicon noise filter, at 220%.
6) back to PS-CS, crop / resize / save for web at 81%.
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I like the sky ... but the plants in the background just sort of "blend into the sky" with little separation. I doubt the colors were similar ... so my guess is that performing your color-to-b&w conversion with Channel Mixer or something similar could have resulted in a much more compelling b&w. If you'd like me to explain more after the challenge is over, send me a PM.
The fence leads the eye nicely through the image but there seems to be a lack of contrast in the image. The full tonal range doesnt look present and so the image seems very light and so a little indistinguished. Adding more contrast would define certain areas of the image and give it a little more tonal depth.