Step 3: Add Contrast
CLICK FOR FULL-RES
You can add contrast to just the pupil and the iris, or, as I did here, choose the whole eye area from lower lashes to eyebrow. Use the Lasso to make a generously feathered selection. Then create a Curves Adjustment Layer. Make an S-curve, or leave the curve untouched and simply set the blending mode to Soft Light, reducing the opacity of the layer until you see what you like. I used the latter method, setting it to 38% opacity.