Use case: identity-preserve. Create a restrained WRY HALF-SMILE expression for this exact fifteen-year-old fiddle-carrying Bridgeburner bust.
Change only mouth, eyelids and one eyebrow: a tiny dry knowing smile with closed lips. Keep him visibly adolescent, with the SAME lank red hair and round healed pockmarks. Do not reintroduce long linear scars, adult stubble, extra age or new marks.
Preserve all other pixels/design as closely as possible: head angle and silhouette, face shape, eyes and nose, skin, mismatched armour, stained olive uniform, straps, broken scorched fiddle, shoulders, palette, lighting, pixel rendering, canvas and crop. One transparent5:6 bust,160x192 logical readability, no new objects, background, text, frame, glow, swatches or extra faces.