1) Always match the skin tone* of the client/person having the nails done:
Dark = Warm Beige or Toffee Fudge
Pale/Fair = Natural Beige or Baby Blossom
2) See if you have warm or cool undertones to your skin pigment, as this will effect how the colour acrylic you choose will look on your nails.
When you see yellow, orange, or olive undertones and veins that appear slightly greener than blue, you’re seeing indicators of warm undertones. Cool undertones will exude a bluish, purple, red, or pink sheen.
Cool undertones = Pink colours
Warm undertones = Beige colours
*A trick is to look at the lightest part of their body. Where the veins meet along the inner wrist is the perfect place to reference. It’s also a great idea to compare skin tone to the person sitting next to you.