This is a brave rose, because she’s trapped behind a chain-link fence. I went out for a walk with my camera this morning and spotted this; the rose was right near the fence, so I moved it to be peeking through one of the diamonds. The background was a house and the rest of the fence, but I opened up to F2.5 to blur it almost completely, keeping your focus on the flower.
By only leaving color in the red channel, everything else went black and white. I used subtle coloring on the rose, a glow effect, and added plenty of contrast. To balance the frame and draw the eye toward the center, I darkened everything else with the burn tool, especially toward the edges. This is a good example of how editing can produce a mood, the mood here being one of sadness and reflection, not only from the rose being behind the fence, but from the dark feel I added, and by alienating the subject from its surroundings with selective coloring.