SCP-819, a humanoid entity standing about 1.8 meters tall, depicted in a mirror. The figure should appear shadowy and unsettling, with distorted limbs and an indistinct facial structure. In the reflection, showcase its dark, hollow eyes and a faint, eerie grin. The surrounding environment should be dimly lit, enhancing the sense of unease and emphasizing the mysterious, otherworldly nature of this entity as it emerges from the mirror.