Presentations or projects are often enhanced by including images. Cornell Library provides a library guide to finding visual resources that includes useful links and information on how to cite images. Some of the information from that guide is included on this page. Unexpected Images is another recommended guide. Susette Newberry, the Head of Research and Learning Services at at Olin Library is the author of both guides.
Google Images is a quick and easy way to find lots of images from web pages across the globe. But it only searches web content that it can find -- many images are actually hidden in databases or archives (whether freely available or in Cornell's subscription databases). The quality of images - size, resolution, description, usage rights - also varies considerably on the open web. Use Google, but don't rely on it for all image searches. Explore this page and Cornell's image databases for more high-quality options.