The position of your light can affect the look and mood of your subject. Digital Camera World offers this helpful infographic:
How to set up studio lighting: 01 High
In most cases you’ll want to have your main light positioned above the model. Notice how the shadow from the nose falls down the face, elongating the features. Ideally you want the shadow of the nose to point towards the end of the lips. The triangle of light on the cheek on the shadow side is often referred to as ‘Rembrandt’ lighting; get your model to move their head slightly to achieve this.
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