Mockup de funda gris con pulseras promocionales de silicon

Photo-real product mockup of a heather gray phone case with "pulseras promocionales de silicon" logo printed at full back. Mockup style: studio flat lay, pastel soft logo palette. Studio-grade photography, sharp focus, natural fabric texture / mug ceramic / paper grain. Magazine-quality merch shot, no watermarks. Logo is generic placeholder typography — no real-brand marks. Realistic product proportions. Target search intent (rendered visually, no on-image text): "pulseras promocionales de silicon" (es).