Sometimes, you can end up with something completely different than what you expect or experience, and the final outcome can still be pleasing.
I remember one early morning in Northern Ontario when I was photographing a pair of trumpeter swans at a beaver lodge, surrounded by vibrant fall colours reflected in the still water (I used wide 6x17 format film camera and concentrated on the section with the beaver lodge), and after I got the film back from the lab, I discovered on the opposite shoreline two stately bucks with nice set of antlers looking in my direction. The swans were nice, but after I lightened slightly the deer in Photoshop, they definitely added the right ingredient to the scene.
Another time, I was paddling on a small creek, and noticed an upset adult beaver who didn't pay too much attention to me.
Anticipating that he was looking for his mate or a young one, I took out the camera from my waterproof case, only to discover a black bear saw with a cub behind the next bend who made a terrible racket behind the bushes just a few meters from my canoe. I suspect that the saw caught the young beaver, but rather than to investigate, I threw the camera back in the case, and started to paddle quite vigorously upstream.