Distance from nose to the upper lip... which NEVER changes... is different. The upper two photos, the distance from nose to upper lip is roughly 1/2 the length as in the bottom two images.
Also, look at the distance from bottom lip to base of chin. In the upper two images, the distance is greater than in the bottom two. In addition, in the upper two, the base of the chin is more squared and symmetrical. In the bottom two, the base of chin is more rounded and non-symmetrical.
Focus on two other features.
Distance from nose to the upper lip... which NEVER changes... is different. The upper two photos, the distance from nose to upper lip is roughly 1/2 the length as in the bottom two images.
Also, look at the distance from bottom lip to base of chin. In the upper two images, the distance is greater than in the bottom two. In addition, in the upper two, the base of the chin is more squared and symmetrical. In the bottom two, the base of chin is more rounded and non-symmetrical.