Portrait photographers Manny Ortiz and Jessica Kobeissi just did a shootout that pitted flash against natural light. The two each shot portraits of the same model in a studio, except Ortiz used an off-camera flash as his main light while Kobeissi only used the sunlight bouncing around in the space.
Here are the portraits that resulted for the different outfits chosen:
Kobeissi says that her only challenge was adjusting to the changing sunlight throughout the shoot. Ortiz says his challenge was being constrained in mobility by his lighting setup.