I keep these websites bookmarked and handy, and rather than constantly searching each one for a specific image, I put together this handy little search tool to just search  my favorite websites that offer copyright-free and royalty-free artwork, both vector and photography. Some of them require subscriptions, but none are hugely expensive. For example, a while back I got a lifetime subscription to StockUnlimited for $29 (or some unheard of price) from Stack Social, and I keep a GraphicStock subscription because it is very reasonably priced for very useful basic graphics and photos.

After you type your search term in the box below, from the results there will be two tabs at the top. Choose the Images tab if you just want the images found.
 
My Search Engine for Royalty & Copyright Free Art/Photos/Clip Art

Full disclosure: The links to StockUnlimited and StackSocial are referral links. It may give you a discount offer, and it may give me account credit also. Win-win. But, as always, I only recommend and suggest websites, apps, and products that I use and find helpful.