Square beauty reference board showing a single adult model in a neutral studio, presented in three aligned views: front, three-quarter, and back. The model has natural medium-length dark brown hair on the left half and a clearly visible long, seamless chestnut-brown hair extension on the right half, demonstrating added length, volume, and blended attachment. Include a small close-up inset of clean strand blending near the side of the head. Soft even beauty lighting, realistic hair texture, uncluttered beige background, no labels, no brand logo, no watermark.