Category:Pictures and images - Wikimedia Commons
from Diigo
Free Pictures - Wylio.com
List of Creative Commons Image Directories and Sites
fotogrph | Free Stock Images. Creative Commons Licensed.
Creative Commons Photos & Creative Commons Images
Free Images - Pixabay
Can I Use that Picture? The Terms, Laws, and Ethics for Using Copyrighted Images – The Visual Communication Guy: Designing, Writing, and Communication Tips for the Soul