The beginning of the brow should be the lightest part, the arch area is the darkest part of the brow, and the brow's tail should be in the middle.
To simulate this effect, pass over the front of the brow the least times, the tail – slightly more times, and the arch the most times.
Do not put a definite/harsh shape in the front of the brow; this makes an eyebrow look artificial.
WHAT ABOUT THE COLOR?
One thing to keep in mind is that one out of three women color their hair.
Many women do not keep the same hair color for their entire life.
If your client changes her hair color frequently, the best thing to do is to go by the color of the hairs in the eyebrow area.
If you want to get a shaded effect, choose a color that is lighter than those hairs. It makes for a natural, undetectable look.
If you want to do individual hair strokes, select a color that matches her natural eyebrow hair. It is better to choose a or warm color. If you want a cooler effect, add 1 part of Brown sugar to 9 parts of a neutral color, but do not use a cool color alone.
If you want to achieve a solid effect, select the color that complements her skin tone.