on Just Publishing Advice:
You always need free images for your blog or social media sites
The days of using Google Image Search to find images to download is over. Apart from the quality aspect, there are problems with the ownership of images indexed by Google.
If you want photos for personal and commercial use, you need to make sure that the images you use are copyright free.
You should also check if there are any attribution required notes on the image licence.
Most royalty free images have a Creative Commons licence.