When contemplating the question, “What colour lip liner should I use?” it’s crucial to consider several factors that can influence your choice. Are you matching your lip liner to your lipstick shade, or perhaps opting for a contrasting hue for a more dramatic effect? Furthermore, how do undertones play into this decision? For instance, if your lipstick boasts warm undertones, would a lip liner in a similar colour family enhance your overall look? Conversely, what about the harmony between various shades? Should one explore deeper, richer tones to create a bold statement or stick with subtle nudes for an understated elegance? Additionally, could the occasion at hand dictate your selection? A casual day out might suggest a different palette than a formal evening affair. Therefore, how do you navigate the complex landscape of colours to find that perfect lip liner that complements not just your lipstick but your entire aesthetic? Wouldn’t that be the ideal scenario?