The direction of the light helps to identify the shape of the subject, determining the position and shape of the shadow. A good example on the face is the nose. One area in which there may be problems with shadows is the place under the eyebrows.
On the human face we see sunken eyes and a protruding forehead. This means that whenever the main light source is located above your object, the forehead will cast a shadow over your eyes. Then you get the effect of two dark circles, where the area around the eyes will be similar to the color of raccoon fur. Eyes are usually the most important part of portrait photography, so it is advisable that they be well lit and not fade in the dark.
There are several tricks you can resort to:
• Move the object to the shadow. Stop at the place where the light coming mainly from above will fill the eyes so that they are more visible.
• You can use a reflector, a piece of white paper, or a white card to reflect light back into your eyes and illuminate them.
• Use an additional light source, such as a flash, that directly illuminates the face to fill in the shadows.
• Position the diffuser in relation to the subject in such a way as to turn the top lighting into a much larger source of diffused light. So you get more light in the eyes.
• If the contrast is not too high, illuminate the area around the eyes selectively during post-processing. Another way to reduce the influence of eyebrows will be something bright, reflected in the eyes of the object. Such lights will add liveliness to the look and make the portrait much more enjoyable