Images make the difference in capturing a person's eye.
While it's best to use original shots where you can, we need to be practical and draw on stock shots from time to time.
I've compiled a list of links to sites that offer images for free under the Creative Commons Licence. While free to use, do check what is required around attribution of the shot - the sites do vary in requirements, and sometimes there are both free and pay to use images on the one site.
ps. I'm constantly adding to the list - so do check back or bookmark it.
If you come across a new source, let me know! I'll add it to the list.
Image sourced from home page of pixabay.