Finding images that you are permitted to use for your work is actually pretty easy. Many photographers and artists make their images available under a Creative Commons license and allow them to be used freely. There are different kinds of Creative Commons licenses, so remember:
- Make sure that the image is licensed for the type of use you intend
- Always give attribution, even if the image is in the public doman (a slide at the end of a presentation or an entry in the References list of a written work is usually sufficient)
For more information on what the different usage rights designations mean, consult the link below: