Magnus, you can apply it, even to your pants... but layering one image on top of another is very easy... the simplest way is to lasso the area first, and then move it with the magic arrow. This is if you're working with one piece on top of another. If you're working with an entire image, there are three modes... Transparent, opaque... and another one. They are located at the bottom of the toolbar, I think... but I'm not sure. I mostly work with the lasso tool, with pieces. I haven't needed to work with entire images yet. By the way, there are plenty of tutorials on this topic online... but I'm self-taught.
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