Crown
¯\_(ツ)_/¯
@UKHypnotist is correct. Celebrity photographers spend a lot of money taking their pictures and they license them in return for payment. It's their job and they will protect their work and expect to be paid for it. They are well within their rights to give a copyright strike. It's the same on blogs. You can't just help yourself to images found on Google images.
Here is a tip for a good source of celebrity photos (and any photo for that matter) which you can use for free so long as you give credit in the description. - Wikipedia. Do a search on Wikipedia for a celebrity, click on the article and then click on a photo that you like. That will take you to a page with all the license information. If it's creative commons or public domain you may use it so long as you give full credit (see below)
Example:
1) Go to wikipedia and search for "Felicity Jones." (British actress) and click on her page -> https://en.wikipedia.org/wiki/Felicity_Jones
2) As you can see, there are 3 photos of her on that page. Let's click on the first one: https://en.wikipedia.org/wiki/Felicity_Jones#/media/File:Felicity_Jones_December_2016.jpg
3) On that photo page, click on the blue "more details" button at the bottom of the page. It will take you to the page with all the license info for the photo: https://commons.wikimedia.org/wiki/File:Felicity_Jones_December_2016.jpg
4)On the license info page, click on "use this file on the web" and it will give you all the license info and how to give credit. YOU MUST PUT THE CREDIT EXACTLY AS WRITTEN THERE IN THE DESCRIPTION OF YOUR VIDEO! Example for this image, you would put:
"Felicity Jones December 2016" By D ick Thomas Johnson from Tokyo, Japan [CC BY 2.0 (https://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
That is how to use celebrity photos in YouTube videos.
Here is a tip for a good source of celebrity photos (and any photo for that matter) which you can use for free so long as you give credit in the description. - Wikipedia. Do a search on Wikipedia for a celebrity, click on the article and then click on a photo that you like. That will take you to a page with all the license information. If it's creative commons or public domain you may use it so long as you give full credit (see below)
Example:
1) Go to wikipedia and search for "Felicity Jones." (British actress) and click on her page -> https://en.wikipedia.org/wiki/Felicity_Jones
2) As you can see, there are 3 photos of her on that page. Let's click on the first one: https://en.wikipedia.org/wiki/Felicity_Jones#/media/File:Felicity_Jones_December_2016.jpg
3) On that photo page, click on the blue "more details" button at the bottom of the page. It will take you to the page with all the license info for the photo: https://commons.wikimedia.org/wiki/File:Felicity_Jones_December_2016.jpg
4)On the license info page, click on "use this file on the web" and it will give you all the license info and how to give credit. YOU MUST PUT THE CREDIT EXACTLY AS WRITTEN THERE IN THE DESCRIPTION OF YOUR VIDEO! Example for this image, you would put:
"Felicity Jones December 2016" By D ick Thomas Johnson from Tokyo, Japan [CC BY 2.0 (https://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
That is how to use celebrity photos in YouTube videos.