- Sepia tones in costumes, props, and set.
- Contrast of innocence and corruption in Mathilda.
- Instances of isolation and alienation among principle characters.
- Bright explosions or blood in contrast to sepia tones.
- Doomed young love between Mathilda and Léon.
- Overt instances of misery, particularly in Mathilda.
- Props – such as weaponry – brighter or shinier in color/tone than the rest of the sepia world.
- Tragic ending.
Image: <http://mentalfloss.com/article/69489/11-expert-facts-about-leon-professional>