To determine which option the artist did not use to show proportion, consider common proportional guidelines used in portraiture.
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Lining the corners of the mouth up with the center of the eyes: This is a common proportional guideline.
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Lining up the sides of the nose with the inside corners of the eyes: This guideline is also widely used in portraiture.
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Lining up the bottom of the mouth with the tops of the ears: This is less common as a proportional line, as the relationship between the mouth and ears can vary depending on the specific oval shape of a face.
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Lining up the inside edge of the eyebrows with the inside corner of the eyes: This is another recognized proportional guideline.
Based on these analyses, the option that is least likely to be a guideline used by the artist is:
Lining up the bottom of the mouth with the tops of the ears.