Strong rule: style --- 3D Pixar ---. A professional man in his early 40s with short, neat dark hair and a well-groomed beard. He wears elegant rectangular glasses and a light blue button-down formal shirt with dark trousers. He has a friendly, intelligent expression with warm brown eyes. He stands in a modern, brightly lit classroom in front of a clean white board. The lighting is soft and professional, highlighting his welcoming demeanor. He has a slim build and carries a black dry-erase marker. The background shows a classroom with organized desks and educational posters. Style is realistic with high detail.
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