You already know the importance of the eye shadows because they make your eyes look more attractive, flirtatious, smaller or bigger, darker or natural, distinctive and stunning.
You can have a look at the chart and check which eye shadows are more suitable for certain eye colors.
So if you have :
Brown Eyes a widespread color. This eye color offers a large range of shades because it’s a neutral color.
Hazel Eyes you can choose between brown and green shadows. If you want to have a natural look, you can select light gold and grey.
Amber Eyes a selection of gold and light brown shades.
Aqua Eyes a variety of brown shades.
Green Eyes choose from purple shades, there are also included silver and pink.
Blue Eyes choose the silvery blue colors and grey -brown ones but you shouldn’t do a heavy makeup.
Source: http://www.findoutcurrent.info/choose-the-right-eye-shadow-for-your-eye-colo/