There are three subjects combined in this photograph: the stone bridge, a flowing stream, and some autumn colors. Any one of these three things can be photographed separately, but a picture is more effective if two or more features can be combined in one frame.
The assignment was to photograph an ancient stone arch bridge in Southwestern New Hampshire for a calendar cover. I knew the bridge from previous visits, but went out to it a couple more times for further research.
First of all it was necessary to get an angle that would show the arched drystone construction of the bridge effectively. The best view was from a low position looking up at the arch and through it, with light and color on the other side.