Begin with the desired effect
Decide whether you want something graphic or relaxed. One gives the outline more importance, the other the transition. Your natural lip shape need not be adjusted to an imagined ideal.
Build from a little
A thin layer makes it easier to observe how a formula behaves. Look at the colour in daylight and alongside the top you plan to wear. Colour reflected from clothing can alter the impression too.
If lipstick is the main accent, let the other elements start simply. This is not compulsory restraint: a strong eye can also make a deliberate composition, with a different result.
Try more than a still image
Speak, smile and check the outline in natural movement. Makeup is a worn shape. Official lip collections offer references for different finishes; follow the particular product’s instructions when using it.
