The following principles should be observed when tattooing lip lines:
1. Distribute pigment slightly darker along the lip line and slightly brighter across the entire lip. Tattoo the lip line first, then the entire lip. 2. Ensure harmony between upper and lower lips. For a longer philtrum, slightly thicken the upper lip; for a shorter philtrum, slightly thin the upper lip. For a smaller chin, slightly reduce the lower lip size; for a larger chin, slightly increase the lower lip size.
3. Age-appropriate color: Women aged 20–35 may opt for slightly brighter shades; those aged 35–45 may choose slightly deeper tones.
4. Lip line design should feature elegant curves with balanced thickness; follow natural contours without deviating from the original lip shape.
5. Apply gentle pressure during lip line tattooing to minimize bleeding; ensure smooth lines and even color distribution.