This is an extremely photogenic old mill that looks great any season of the year and is easily accessible.
After parking in the lot near the mill, walk across the bridge. This is the first good viewpoint for photography. Next, I recommend walking under the bridge, this is my favorite spot for taking photos. The whole area is free to walk around, you can even walk in the mill and then walk up stream down the side. Feel free to adventure and take pictures wherever you see fit!