Industrial design sketch of a futuristic consumer product, clean perspective, precise linework

industrial design sketch of a futuristic consumer product, clean perspective, precise linework, functional minimalism, subtle marker rendering, grayscale with light warm accents, sharp edges, balanced proportions, visible construction lines, iteration thumbnails in background, high-end product design presentation, soft shadows, white paper texture, refined and professional sketch style --ar 3:4 --style raw --v 7