How can you fill in shadows while shooting outdoors during the day?

Using a reflector to fill in shadows while shooting outdoors during the day is an effective technique because it works by bouncing natural light back onto the subject. This helps to soften deep shadows, particularly on the face or other important parts of the composition, creating a more balanced exposure without adding the harshness of an additional light source. Reflectors are portable and can enhance the quality of light, ensuring it looks natural.

The other options don't provide the same level of effectiveness in handling shadows. Adjusting camera settings can help with overall exposure but doesn't directly address shadow detail, while using artificial lighting can be challenging during the day due to competing daylight, and restricting sunlight exposure often limits opportunities for capturing interesting lighting dynamics.