We discourage the use of any image or content that can easily be found or taken from the Internet. Not only is it possible for you to end up violating the copyrights of the original owners, but it is also against our policy to pass off something as your own. This may also lead to your entry’s rejection, making you lose the chance of winning the contest you are interested in.
We would still like to ask you to use your own created images that you have complete rights over. It would also feel much more fulfilling to win with an entry that is 100% yours.