Copy right !
According to experts like Daniel Scocco,don’t copy material just because you are not making a commercial use. A lot of people wrongly think that if they credit the author of an article or image they are not violating the copyright law.Use other materials that are not subject to cop. Alter the picture is not the solution.
Experts believe that you can get anything from search engine like Google images but using them will almost certainly violate someone’s copyright.