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First suggestion: Study poses in old portraits that you like. Notice how the body is posed. How are the shoulders turned/one dropped? Notice the best portraits rarely have straight subjects. Examine paintings as well as photographs. Good portrait photographers evaluate the shape of the face, it's symmetry or lack of symmetry, it's features such as eyes, nose, forehead, chin, cheekbones, and lips, for example. How can the subject be posed to hide or reduce unappealing features, emphasize good features, and make the face look more symmetrical? How can you make a face look more engaging? Do you want it to be soft and gentle or strong and bold. Posing sets a mood as much as lighting.