Selecting the same Ellipse Tool (U), it’s possible to represent one more highlight of white color.

The layer’s parameters: Fill 10%
Blending mode-Hard Mix

Next we have to make the eye for the emoticon, applying the well – known Ellipse Tool (U).

The layer’s parameters: Blending Options>Outer Glow

Blending Options>Gradient Overlay

Gradient’s parameters:

Make a copy of the last represented layer and choose Free Transform option to place the copied layer the same way shown below, changing also the parameter for the new layer.
Blending Options>Gradient Overlay

Gradient’s parameters: