Features are individually distinct without one dramatically dominating the others.
Contrast level is a description of a visual relationship, not a ranking — no contrast level is presented here as more attractive or more correct than another.
Contrast level varies enormously between individuals within any broad group — hair colour, eye colour and skin tone combine in many different ways, and no demographic shares one uniform contrast pattern.
A genuinely wide range of colour combinations tend to feel balanced.
Jewellery and eyewear can shift the overall feel warmer, cooler, softer or bolder with relatively little risk.
Flexible — both soft and confident palettes commonly work.