It's worth noting that if the author finds images the proper way citation is often sometimes not required. A good resource for this is Awesome Images, my personal favorite site listed there is Pexels. Always make sure you're aware of what license an image is under and what the terms of that license are. If one isn't explicitly provided, it's considered under copyright and using that image for an article would be infringing.
While it might be not explicitly required, I am positive mentioning the author who helped us to make the writing more attractive is worthy.
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