Original picture:
1. Open the picture you want to PS, select the "Zoom Tool" in the toolbox, and enlarge the eyes;
2. Create a new layer;
3. Select the color you like and use the brush tool
, draw (as shown below) the eye shadow effect;
4. Select Filter-Blur-Gaussian Blur;
The blur radius is about 3.0 pixels;
6. Set the eye shadow layer mode to "Soft Light" and the opacity to "70%".
Effect: