Fair use of Online Images
copyright and fair use
fair Use online images
You are allowed to use online images that are copyrighted as long as you cite the source from which you got the image from. If you don't cite the author or website, you can get sued or even face worse consequences, such as prison
how to know if an image is copyrighted and what it means
If a image contains the copyright symbol, which is a c with a circle around it, then it is copyright protected. However, if it does not have a sign, search google images with the picture to see if it comes in your search results. if it does not, it is most likely copyrighted.
Examples of websites with free images (no copyright restrictions)
Copyright and Fair Use: The Google Images case