It's pretty easy!

In the Layer Palette adjust the following in single layers: 1) Levels  from the upper tool, 2) General Hue&Saturation. 3) Select with lasso tool Eyes and take off the blue in eye's white part with Hue&Saturation (take off the blue) - use the pen to rescue the blue in iris's eyes. 4) Select with lasso tool teeth and take off the yellow of teeth with Hue&saturation. 5) Select with lasso tool determinate part or skin and face (feather-2x)and apply Exposure to get more light into their faces; and Voila! :)