Retouche literally means 'retouching', like when you edit a photograph to improve it. It’s a wonderfully modern-sounding word to find in this classic song from 1945.
Édith Piaf uses it to create a perfect, unfiltered image of her lover, singing, "Voilà le portrait sans retouche" (Here is the portrait without retouching). This beautiful metaphor means she sees and loves him exactly as he is, with no need for any changes or improvements.
This song is one of the most famous love songs ever for a reason! Édith Piaf sings about a love so powerful it changes the way she sees everything. The title itself, "La Vie En Rose," means seeing life in pink, or through rose-colored glasses. For her, this feeling comes from one person. She describes him with such simple, perfect details, like "Un rire qui se perd sur sa bouche" (A laugh that gets lost on his mouth), calling it the "portrait sans retouche" (unedited portrait) of the man she belongs to.
It's all about how his presence transforms her world. When he holds her and speaks softly, she says, "Je vois la vie en rose" (I see life in pink). All her troubles and sorrows just disappear. He has promised they are for each other for life—"C'est lui pour moi / Moi pour lui dans la vie" (It's him for me / Me for him in life)—and this love brings her a happiness so intense she feels she could die from it. It's a total, all-consuming declaration of love.