Although you do not need to use full APA citation style in your capstone project slide presentation, website, or other online platform, you do need to give attribution to objects that you did not create.
NOTE: Royalty free clip art, such as those you find through MS Word, do not need attribution. However, a note in the image caption shows that attribution was not overlooked, e.g. Image from Microsoft Word 2016.
Librarian curated lists for finding Creative Commons and royalty free images:
Open Educational Resources (OER): Images - Courtesy of Tidewater Community College
Images: a guide to finding visual resources: Open Web - Courtesy of Cornell University
Finding and Using Images: Stock Photos/ Clip Art - Courtesy of University of Illinois at Urbana-Champaign