Hi. I checked the images and found out that most of them are copyrighted or their license is not clear. We encourage our authors to use public domain images and such. If the copyrighted picture is absolutely necessary to prove a point and there are no free alternatives, then you can use one of them but you need to state that and it's used for an educational purpose.
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Hello @eniolw, thank you for the heads up. I have just updated the post by adding a little note at the bottom stating that the images are for educational purposes exclusively. In the future, I will take your comments here into account while creating posts. Thank you again