More Brilliance In The Eyes
To make the eyes pop, make a selection of the iris (you can use the Quick Selection tool [W]), and then add an Exposure adjustment layer. If you drag the Exposure slider to the right, you’ll get brighter eyes. But if you also drag the Offset slider to the left, you’ll get more contrast/detail. This is a very easy and fast technique if you like to brighten eyes with details.
by Calvin Hollywood