Verification and copyright is an issue that must be dealt with when publishing online or anywhere else. Always stress to students that they should not put up artwork belonging to an artist without permission and acknowledgement. If you were to use an image from the hundreds available in the Ultranet or available from The Learning Federation remember to include the owner or copyright of the image.
Always insist that students create bibliographies. Images should follow the attribution and copyright set by the creator. When publishing student work parental permission should be sought. You can find out more about DEECD Learning On Line. The Smart Copying website is a useful source of information on this issue.