I have been told to wear cool lip colors with cool blush and cool shadow colors. Does it matter if I mix cool with warm tones? Is it always obvious whether a color is cool or warm? There are some basic rules regarding cool and warm tones. Most important, foundation and powder should always be warm-toned. In addition, blush and lip colors should both be of the same tonal family. It’s up to you whether blush and lipstick are warm or cool shades; just be sure that they go together. For the eyes, the choice is whether you want shades to be warm (more natural, for day) or cool (more high-contrast and dramatic, for night).