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Let's assume you are using two pictures, a background picture and a top picture (Layer 1 and 2)
Select layer #2
In the layer tool box, on the bottom, you see a box with a circle in it. It's ADD A MASK. Click on it. You will see a link appear next to your image on the layer box.
Your colors will go to black and white.
I recommend you put the opacity of this layer at 50% now so that you can see the bottom layer.
Use the airbrush and make sure BLACK is selected as the foreground color. Wherever you paint in black will remove from this layer and show the bottom layer.
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