Use the uploaded photo as the only identity reference. Transform the person into a photorealistic handmade pebble mosaic. Preserve the exact facial identity, proportions, face shape, eyes, eyebrows, nose, lips, jawline, ears, hairline, hairstyle, facial hair, age and expression without any change. Recreate everything using thousands of extremely tiny natural river pebbles, matching the provided pebble reference: very small, tightly packed stones with realistic variations in shape, texture, size and shades of beige, cream, gray, brown and black. The result must look physically handcrafted, not painted, CGI or a filter. Realistic depth, tiny gaps, adhesive, contact shadows and natural stone imperfections. Vertical 9:16 composition, subject perfectly centered with a little empty space above and below, close-up portrait, ultra-photorealistic macro detail, natural lighting, no text, no frame, no extra people.