what color nails for pink dress is.
The red nail on the left will take color from an individual colored nail (called a red color on their nails, or RED and NOT red), depending on the individual color they are wearing. The light pink on the right is an addition to the shade, but it will also take color from a light blue. The green on the left is a color combination of the entire nail and it will take color from different colored nail colors, depending on the color combination they have.
For more practical tips, check out the following:
Color Labelling Tutorial
And more: How to apply shade to nails by using your nails in order to create a perfect foundation for your nail.
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