GIMP is the free alternative to Photoshop, and many of the things that you can do in Photoshop, you can also do in this open source software. Want to see how you'd look with a lip piercing, or want to touch up a photo and add one where there isn't? This tutorial shows you how to add a fake lip piercing to nearly any photo. It's not that difficult - as long as you're familiar with the basics of GIMP, you'll be able to make this work for you!
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