In this tutorial, we will teach you how to make vampire teeth in Photoshop.
For this tutorial we will be working on a free stock image which can be downloaded from the following link:
http://www.sxc.hu/photo/545371
Silver Chinchilla:
http://www.sxc.hu/browse.phtml?f=view&id=1331600
Splash Background:
http://www.sxc.hu/browse.phtml?f=view&id=1161839

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Step 1 -- Black and White Adjustment Layer
First of all, we will add 4 adjustment layers. Let's start by first adding the Black and White adjustment layer. From the presets panel, make sure you choose the maximum Black option. With that done, reduce the opacity to 50 percent and change the blend mode of the layer to Overlay.
Step 2 -- Hue and Saturation Adjustment
Next, we will add the Hue and Saturation layer. Over here, we will keep the Hue value to +26 and saturation to -21.
Step 3 -- Levels Adjustment
With that done, we will add the Levels adjustment layer and will only change the middle value to 0.80.
Step 4 -- Gradient Map
Last of all we will add the gradient map adjustment layer and choose 373737 for the left side and f6ead9 for the right side gradient. With that done, we will reduce the opacity of the layer to 50 percent and change the blend mode to Hard Light.
Step 5 -- Replacing the Eyes
For this tutorial, we will be using cat eyes. Open up the Silver Chinchilla image and pick up the polygonal lasso tool to make a selection of the eyes. Once done, copy and paste the selection on to a new layer.
Do the same for the other eye as well, duplicate both the layers and bring them on the original document.
Step 6 -- Merging the cat eyes with the image
Over here, we will resize the cat eyes and position them on the eyes of the model.
With that done, let's decrease the opacity of the layer to 50 percent so that we can see what's behind the image. Next, we are going to add a layer mask. After that, we will pick up the brush tool, make sure that the black color is selected for the foreground and apply the brush on the sides of the eye to erase it.
We can use the eraser tool for this but there is no going back once the eraser tool is applied. This is a non-destructive way of editing in Photoshop, and in case you want to change something later on, you can always edit the layer mask.
We will do the same thing for the other eye as well. You can change the opacity back to 100% when you're done.
Step 7 -- Adding Layer Style to the Eyes
Once done, let's open up the layer style options.
Over here, we will first apply the Inner Shadow option. We will keep all the options as it is except the angle. Change the angle to 160 degrees and move to the color overlay tab. Over here, we will choose dfca98 for the color fill and change the blend mode to linear burn. Next, we will move to the gradient overlay option, change the blend mode to color burn, reduce the opacity to 50 percent and change the angle to 0 degrees.
Once done, we will copy the layer style and paste it on the layer which has the other eye. You can make further changes, experiment with different values here to see what would look better.
Step 8 -- Working on the background
Now let's change the color of the background. For that, we will add a gradient map adjustment layer and choose 2d2b20 for the left side and dccea0 for the right. With that taken care of, change the blend mode of the layer to Multiply.
Step 9 -- Removing color from the Face
Since we want to change the color of the background only, we will enter the layer mask, pick up the brush tool with black color selected for the foreground color and apply it over the face.
Step 10 -- Blending the face with the background
With that taken care of, let's start adding effects to the face. For that, duplicate the original layer and hide the rest of the layers. Now change the blend mode of the duplicated layer to linear burn and add a layer mask. With that taken care of, we will pick up the brush tool once more and apply black color over the background. Make sure you have the layer mask selected while applying the brush over the layer otherwise you will be just adding black color over the canvas.
Be careful of the edges. You can increase the hardness of the brush to a 100 percent to remove the edges completely. Once done, reduce the opacity of the layer to 75 percent and unhide the rest of the layers.

The rest of the lesson you can find in this video.