Why is my picture not showing up next to my comments on Facebook?

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Facebook thumbnail issue:

I have written a review on someone’s Facebook page but for some reason my image doesn’t appear next to my comments. I have my own Facebook page, with a profile image, photos etc. All my images are in the right sizes. Also, I believe images and photos are set up correctly but the thumbnail photo is not displaying every time I share content or make comments on other peoples Facebook pages. Any suggestions?

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