When in Google Images, look for the "Advanced Search" option. Click on that link and look for the "Licensing" option. Choose "Free to Use & Modify". This will only display images that are "Open License". You still need to be careful about giving proper credit to the source but these images are useable on HubPages. Generally, you see a lot of pictures from Wikimedia, Flickr and Pixabay when using the "Free to Use" filter. One note: This filter will severely limit your Google Image search results.