First of all, having looked through the original Negative Space challenge, I must give kudos to Remie, who certainly inspired my shot.
This did involve quite a lot of editing - but all legal. The sky was blue with some clouds, so I used Hue/Saturation to brighten the blue sky to white. Then I increased contrast to flatten the sky to bright white. Using a second stage of Contrast/brightness to bring the sky up to a reasonable shade of grey. Finally I sepia toned it.
It's not the most faithful photo I've ever taken, but I do quite like it. If it gets >=5.000 I'll be very happy indeed.
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I liked the "cowspace" photo in the last challenge, and this is a similar theme. I like this one better, since there is some depth and perspective to the landscape at the bottom which keeps the photo from seeming off-balanced.