2. Tight framing of your subject:
3. Shoot in B&W for an interesting take.
The soft and balanced light of an overcast day is also helpful for photographing waterfalls because it helps reduce contrast and reveal detail in the shadows.
Another great benefit of photographing waterfalls/streams on overcast days is the need for longer shutter speeds. Since cloudy days are significantly darker than sunny days, you’ll need a longer shutter to capture the scene. These longer shutters are great for achieving that “silky” water look like in the photo above.From: PhotoNaturalist
5. Capture the gloomy mood:
6. Try experimenting with a Gradual Neutral Density Filter:
7. Cloudy days are great days to get interview shots outdoors, so that the sun is not in the eyes of your subjects: