How can I create a split lighting portrait that effectively showcases contrast and depth in the subject?

To create a split lighting portrait that effectively showcases contrast and depth in the subject, position a single light source to one side of the subject, dividing the face into two halves with one side in light and the other in shadow. This technique emphasizes the contrast between light and shadow, creating a dramatic effect that enhances the depth and contours of the subject's features. Adjust the angle and intensity of the light to control the level of contrast and experiment with different poses and expressions to capture the desired mood and emotion in the portrait.