How to Use Photoshop to Retouch Facial Photos

This tutorial will outline how to retouch and enhance people's faces in Adobe Photoshop.

Steps

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   To start, get rid of the obvious blemishes. The healing tool is designed with this in mind. Simply hold ALT and click a clean spot of skin (change the brush size first, if necessary) and then click the imperfection. Repeat on all undesired spots.
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   Remove the yellow teeth. Select the teeth with one of the lasso tools and paste into a new layer. Masking helps if you select too much of the area and need to erase parts of the gums/lips. Use the selective color adjustment to remove yellow.
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   Use the blur tool to even out skin tone. Use the blur tool and paint over the skin, making sure not to go over prominent parts of the face, like the eyes or hair.
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   Give the skin a healthy color, again use the selective color adjustment and play with the red tones. This will help get rid of unnatural skin tones. You can also boost the saturation of the entire photo to give it a more vivid look. Click ctrl-U (or command-U on a mac) to bring up the Hue/Saturation adjustment dialog box.
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   Sharpen key areas, this will help bring the person more to life. Hair, eyes, noses etc often look better with added sharpness. However, do not use too much or it will look grainy. You can sharpen the image selectively using the sharpen tool and changing the brush size.
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   Use the diffuse filter (Filter>Stylize>Diffuse...) helps even out features and gives the person a "softer" appearance. Run the filter and fade it to 40-50%. This will give it that soft glamor shot look.
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   Duplicate the layer (Layer>Duplicate Layer) and then fully desaturate it (Shift-Ctrl-U). Set the blending option (found in the upper-left-hand corner of the layers palette) of the desaturated layer to "overlay". Next experiment with the Gaussian blur filter (Filter>Blur>GaussianBlur...) as desired (A pixel-width of 3-5 should work). This will make most photos even softer look, while maintaining their sharpness.
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   Use the sharpen filter if the image looks a bit too soft or use the sharpen brush to accent dull areas.

http://www.wikihow.com/Use-Selective-Coloring-in-Photoshop

How to Use Selective Coloring in Photoshop

If you ever wanted take a a picture,make it black and white then return the color to certain parts...follow these easy steps.

Method 1 of 2: Photoshop CS and earlier

1

Open Adobe photoshop and open a picture

2  Go to "Layers" and duplicate the layer,this will create an extra layer located in the lower right hand corner

3

On the duplicated layer,turn it black and white

4

Create a layer mask for your black and white layer by clicking the icon at the bottom of your layers palette.

5

This adds a white (blank) mask in your layers palette linked to the image. Click the mask icon to select it.

6

Now grab the brush tool in you toolbox and mask the section you want colored by painting directly onto the mask (black will hide the layer and show the color layer underneath, white will show the layer and keep the black and white version).

Method 2 of 2: Photoshop CS2 and higher

1. 
   1
   Open Adobe photoshop and open a picture
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   From the layers palette click on the adjustments layer icon and select Black & White.
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   This creates a new adjustment layer with a blank layer mask. To bring color back to a certain area simply click on the mask icon to select it and paint with black to hide the effect.
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   If you mess up, switch to white to bring the black and white effect back in.

Source: http://www.wikihow.com/Use-Selective-Coloring-in-Photoshop