Create a 3D T-pose model of a Pokémon trainer named Heidi in the style of official Pokémon female trainer models. She has short brown hair, bright blue eyes, and wears a light blue jacket, yellow undershirt, dark gray shorts, and white sneakers. Include a small trainer's backpack and a Pokéball holder. Use clean, stylized textures and proportions consistent with the Pokémon series, with a cartoony aesthetic