What are good guidelines to follow here?
What are good guidelines to follow here?
Stock photo services require you to pay for a license, creative commons licenses confer the right to use an image under certain circumstances and public domain images are not subject to copyright in the first place.
Fortunately, to make it easier for you, Google allows you to filter images according to its licensing, so you can opt to view only images which are available for non-commercial redistribution. Just click the Search Tools button and it'll let you do it through there.
If you want to do it privately, [email protected], with a subject line of like, GRID AD: