I am not using any pictures in article for now, it is difficult to get 100 percentages copyright image for me and for this I am not integrating any images with articles.
You can use images from Wikipedia as a vast collection of their photographs are available for free reproduction because their contributors have waived off their copyrights. It is safe as you will be able to know this by clicking on the desired pictures whether they are permitted or not. But do give credit to them if you use Wiki photos.
Wiki commons has a separate wing called Public Domain. All those images in this domain are copyright free.
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