To use Creative Commons to find images, use the following link:
https://ccsearch.creativecommons.org
Put your search terms in the box and hit "Enter" to search. To filter results, click on Filter, and filter by CC license, provider, creator, etc.
"Please note that CC does not verify whether the image are properly CC licensed, or whether the attribution and other licensing information [they] have aggregated is accurate or complete. Please independently verify the licensing status and attribution information before reusing the content. For more details, read the CC Terms of Use."
from the Creative Commons website: About