Prompt
Retouch only Killua Zoldyck’s face. Keep the entire original image, composition, camera angle, pose, body, clothing, hair silhouette, lighting, background, Gon, perspective, and all other elements completely unchanged.
Refine Killua’s facial features to look more faithful to his canonical HUNTER×HUNTER appearance: youthful boyish face, slightly softer and rounder facial structure, subtle cheek fullness, large clear blue eyes, small delicate nose, small natural mouth, and a relaxed neutral expression.
Keep his head turned in exactly the same direction as the original image and preserve his gaze toward the distance, as if quietly watching down the train platform while waiting for the train. Do not make him look directly at the viewer or at Gon.
Make his expression calm, slightly bored and naturally relaxed rather than serious, stern, mature, or intense. Preserve the original lighting and shadows across his face so the retouched face blends seamlessly into the existing illustration.
Do not beautify or over-render the face. Match the same painterly anime rendering, brush texture, line softness, color treatment, and level of detail as the surrounding image.
