Whether in your advertising or in your shop decor, you may want to use a striking image or fantastic photo that you found. But be careful: the image may be copyrighted, and without a license to use the image, you may be committing copyright infringement.
"But," you say, "copyright licenses can be expensive, and my business doesn't make that much, and besides no one will probably know." All fair points, but none a proper legal defense. So here are some ideas if you want to use images but can't afford licensing fees: