Let us know what sites you used, that way we can read a bit more about the topic.
Have a read about fair use images and creative commons. Wikimedia is a good place to find a lot of images, most of mine are from here.
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I have seen and read your article on this one: https://steemit.com/steemstem/@physics.benjamin/the-wonders-of-the-electro-magnetic-spectrum-light-interaction-why-you-see-the-colours-you-do
now I understand, I will do it in my writing in the future.
thank you for your suggestion, this is very useful for my writing.