3D Model: Create Two Realistic 3D Human Characters Based On A Vintage Black-and-white Photograph. Character 1: An Adult Man Standing With A Serious Expression, Hands Behind His Back. He Has Short Dark Hair And A Thick Mustache. He Is Wearing A Plain White Long-sleeve Shirt Tucked Into High-waisted Black Dress Pants, With Dark Leather Shoes. His Posture Is Straight And Formal. Character 2: A Young Boy Standing Next To The Man With His Hands In His Pockets, Also Looking Serious. He Has Short Light-colored Hair. He Is Wearing A Plaid Button-up Shirt With A White Collar, Black Pants, And Dark Shoes. The Style Is Typical Of The 1950s-1960s. Both Characters Should Be Modeled In A Neutral Pose (T-pose Or A-pose If Required), With Clean Geometry And Natural Proportions. Output Format Should Be GlTF (.glb) Or OBJ. Use Realistic Human Textures. If Possible, Use The Attached Image As Reference For Body Proportions, Facial Structure, And Clothing.