Retrato literally means "portrait" or "likeness". It's a visually evocative word that isn't as common in song lyrics as more abstract terms, making it stand out.
In the song, the line "Pedazo roto de hombre en la tierra retrato" paints a powerful, almost fragmented image of a person. It suggests a broken, incomplete picture of a man, adding a layer of depth and introspection to the song's themes of loss and pain. This metaphorical use makes it particularly memorable and enticing.
Spanish pop star Alejandro Sanz does not do gentle breakups. In "La Despedida" (The Farewell), he goes full melodrama, describing himself as a "pedazo roto de hombre en la tierra" (broken piece of a man on the ground). Rather than moving on quietly, he talks about blood running over his hands in anger and warns that "el lobo en mí se vengará" (the wolf inside me will take revenge). He even begs his ex, "para de cebar la fiera" (stop feeding the beast). It is extreme, theatrical, and completely unapologetic about how messy grief can look when pride takes a beating.
Yet behind all the wild anger, the song hinges on one very simple, desperate plea: "apaga las luces y canta conmigo así me olvido de la despedida" (turn off the lights and sing with me so I forget the farewell). He is wandering around lost ("voy sin saber" [I go without knowing]), yelling on street corners like a drunk man ("en cada esquina cruel grito por la despedida" [on every cruel corner I scream for the farewell]), and begging for one last shared tune in the dark to delay reality just a few minutes longer.