Thanks for the comments so far, guys. The "flower" in the left image, third step from the top isn't actually a flower, it's just some green vegetation with leaves larger than the surrounding blades of grass or whatever. So selective color techniques wouldn't accomplish anything there. The two views don't match perfectly; there is some overlap, but that patch of vegetation is at approximately the same height in both images. The white line in the right image ends just above the top of the frame of the left image.
I shot these with my Olympus SP-350, and had dynamic range to worry about. While shooting the left image, I had to back down a ways from the top of the stairs in order to keep the highlights at the top and a reasonable amount of detail in the lower stairs. Exposure on the left image was 1/6, f/4, ISO 50 (hand-held, too!), and exposure on the right was 1/60, f/4, ISO 50.