Generate a hyperdetailed photorealistic pencil sketch of an Asian chef cooking stir fry on a wok. The chef is holding the wok with blue potholders, tossing noodles, vegetables, and cooking oil into the air, captured with high-speed photography to freeze the motion. The image is zoomed in on the chef, who is facing the camera, with a determined expression. The noodles and vegetables are colored in a vibrant palette, while the rest of the sketch remains in grayscale. Apply a Duotone Effect, using a warm color for the chef and a cool color for the background, to create a dynamic and visually appealing contrast.