Friday Fotos: Variations on a (mono)chromatic Theme

Once again: What does it mean to take a photo? This photograph, believe it or not, is a color photo. I took it in a snowstorm, and that pretty much eliminated color. The color of the river, of course, comes in some measure from reflecting the sky. On a bright day with a blue sky, the water is blue. On a snow-stormy day, there is no blue to reflect, and so the water appears grayish. The most obvious hint of color is in the dingy atop the cabin of the boat. Here is another, brighter, rendering of the same photo: And now we enter photoshop territory. The color play is not so blatant and flamboyant as in these moonshots, but it's certainly there.
Am I to think of and consider these images individually, or as a group? This one moves a bit from the rather restrained territory of the others: Why?