This is a special effects tutorial which is very easy to do. I will be using a Gradient. I will also use the Clone Stamp Tool.
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Step 7 : Press CTRL+SHIFT+U. This will desaturate layer1 on which this image is.
Step 8 : Click the Add New Layer button and Layer 2 forms.
Step 9 : Click the Gradient Tool.
Step 10 : Click where the white arrow points to to bring up the Gradient Editor.
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Step 12 : These are the Gradient presets available in PS. You can choose any of them i.e. the ones in color. I have chosen the one the small white hand points to.
Step 17 : This is how the image looks.
Step 18 : Now continue dragging with the Gradient Tool in all directions and the sides of the image. You will find the gradient will change till you have a very beautiful effect. You will get an effect depending on the Gradient you choose.
Step 19 : Ctrl+Click the layer thumbnail in Layer 1.
Step 20 : CTRL+clicking will make a selection to appear on your image.
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Step 22 : You can lower the opacity of Layer 2 further if you want. I have lowered it to 20%.
This is how the image looks like.
Step 23 : Go to Layer>Flatten Image.
Step 24 : Press CTRL+L.This brings up the Levels dialgoue box. I have dragged the Black slider at the left to the edge of the graph. Click ok.
This is how the image looks.
Step 26 : I have zoomed in on the lips.
Step 27 : I have clicked on the Swatches.
Step 28 : I have clicked on a color. Note that the cursor changes to an eye dropper.
Step 29 : Click on the Brush Tool.
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Step 30 : I have painted over the lips with the color I chose. I know it looks horrible.
Step 31 : I have reduced the opacity of the layer to 25%.
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Step 1 : I have opened this photo in photoshop. You can choose the image you want. 
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Step 2 : Open a new white layer.
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Step 3 : Click on the Add New Layer radio button and a new Layer1 forms.
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Step 4 : Click the Clone Stamp Tool. To make the brush size large press ] (right bracket key) and to make it small [ (left bracket key). To make the brush soft press SHIFT+[. 
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Step 5 : Alt+Click with the Clone Stamp Tool after making the brush size large to include the face. Also make it soft.
This is a soft brush. Press SHIFT+[ a number of times to soften the tip.
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Step 6 : Now click with the Clone Stamp on the blank white document. This is the result I got.
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Step 11 : The Gradient Editor opens.
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Step 13 : In the top panel change the Mode from the dropdown to Difference
Step 14 : Drag with the Gradient in any direction in the image. I have dragged diagonally down.
Step 15 : This is how the image looks.
Step 16 : Lower the opacity of the layer. I have lowered it to 50%.
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Step 21 : Click the Add Layer Mask radio button and a layer mask form next to the layer thumbnail on Layer 1.
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This is the finished image. You can clone any number of images and then follow the same steps.
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Step 25 : I have clicked on the New Layer icon and a new layer 1 has formed.
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Step 30 : I have painted over the lips with the color I chose. I know it looks horrible.
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And here is the finished image.