Use case: identity-preserve. Change ONLY the expression of this exact Surly bust from impassive to a very restrained COLD SMILE.
One corner of the closed mouth lifts slightly; eyelids narrow a little, eyes remain assessing and unsympathetic. The expression should feel controlled and threatening, never warm, flirtatious, theatrical or broadly grinning.
Preserve the exact same plain narrow face shape, short mousy fair hair, BROWN eyes, dusky BLUE skin, age, head angle and position, grey salt-stained robe, shoulders, canvas, lighting, palette, pixel style and crop. No cosmetics, beauty treatment, new adornments or changed clothes. Only eyebrows/eyelids/mouth may change.
One transparent5:6 bust,160x192 logical readability, no new background, glow, text, labels, extra views, hands or frame. Keep non-expression regions as close to identical as possible.