Airbrushing is useful if you have a bad quality image that you want to use, or you want to erase some detail in an image (such as wrinkles or smudges).
Look at how bad this image is:
And when you zoom in….
Open up your image in PSP.
Click , and if the Tool Options don’t show up in a small box, then right click the hand tool and click ‘Tool Options’.
Change your settings to these, if you’re using a big image you might need to try a higher opacity:
Now use your mouse to go carefully over the image. Zooming in might help. If it goes too blurry, then go to Edit > Undo, and try again.