The Death Note's face requirement does real psychological work, and the series treats it as fact rather than flavor.

Light cannot kill someone from a name alone — he needs their photograph, their eyes, the specific geometry of their particular face on the page, which means this isn't a game balance but a confession about how killing actually works in the human nervous system.

Watch the notebook scenes: Light writes a name and nothing happens, he writes it again and still nothing, but the moment he pairs it with Lind L. Tailor's face—that specific arrested image—the man dies.

The series then systematically tests what happens when you remove the face—Light begins killing from mug shots, surveillance footage, television broadcasts, progressively degraded images and fragments of people he's never personally seen. Crucially, the show documents his psychological transformation alongside this distance: he becomes colder, more abstract, because the face isn't preventing atrocity but anchoring his conscience to a specific human rather than a category. This explains why the surveillance subplot matters—the Shinigami King's camera sees *everything* but cannot kill, the eyes witness but the hands don't hold the pen.

The show recognizes what modern algorithmic systems have made possible: you can surveil, judge, and execute without ever seeing the face, so the Death Note requires the face because someone in 2006 Tokyo understood that screens and databases had already solved that problem for us.