First, remove any marks and spots with the Healing brush. To use it all you have to do is left-click on the area you want to correct then if by magic, the blemish is removed.
Next, select the Pipette tool and sample close to the dark circles under the eyes. This will change the colour of your foreground to something that matches your model's skin tone. We are going to use the Paintbrush tool to paint the colour in but before you start applying the colour, reduce the opacity and flow of the brush so when the colour's applied it's a little more subtle. Pick a suitable brush size then paint over the problem area in smooth strokes. You can also undo (Edit>Undo) if you think the changes are too obvious and re-paint.
When you've done removing dark circles duplicate your layer and make sure the layer under the top layer is selected as we are going to be blurring this layer. If you want to view the changes as they're made, click the eye icon next to the top layer to hide it so the one underneath becomes visible. Then go to Blur>Gaussian Blur to blur your subject's face slightly.
Make sure the top layer is now visible, select it and create a layer mask by clicking the icon which looks like a circle sat in a rectangle at the bottom of the layers palette. With your foreground colour set to black and the Paintbrush tool selected, paint over the face to bring some of the blur back to create the airbrushed feel we are looking for. If you find the shot's a little too blurry, reducing the opacity of the brush will stop too much blur coming back through.
To find out how to brighten your subject's eyes take a look at our previous tutorial: brighten eyes.
If you want to add a little colour to your model's lips select the Pen tool and draw around their lips, adding anchor points until your selection is joined up. Right-click on the image, select 'make selection' and hit OK. Next, click on the adjustment layer icon (black & white circle) and select Hue/Saturation. When the new window opens adjust the sliders until you find a shade you're happy with.
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