Even a slight change in the shade of the hair can completely transform the look. Consider the examples of stars, how warm and cold tones affect the appearance.

According to stylists, reddish, orange and golden colors add brightness to the face, and also make the look more “warm”. To create this effect, shades of golden blond, caramel, copper and chestnut are recommended.
On the other side of the spectrum are cool shades like platinum blonde, black and cherry. They, respectively, make the look colder due to the content of blue, purple and green highlights.
Brown hair color

In the photo on the left, Eva Longoria wears a cool dark brown shade. As we can see, the change to a warmer color made the actress's complexion look fresher and he althier, adding a blush.
Red hair color

Kristina Hendrix goes both shades of red. When the Mad Men star wears dark copper hair color, it makes her blue eyes look very bright. And shades of warm orange, like the one on the right, add more color to her face.
Blonde

Blonde Reese Witherspoon knows how to emphasize her beauty. Her blonde hair adds sparkle to her eyes. Using Reese as an example, you can see how effectively you can use both cold and warm blond to look great with both.
So, should you add warm colors to your hair color? Stylists recommend this to those who feel too pale and want to go brighter. On the other hand, warm colors tend to redden the skin and require careful application of a corrector to hide the excess redness.
If you can't decide which shade suits you better, try ombre. Or ask your stylist to use a warm tone of paint to add some bright highlights to the hair that frame the face.