Remember that not all Open Access Images are licensed the same way. Always double-check the usage rights for any image that you plan on using, no matter the nature of your use.
Keep in mind these possible related limitations on image use:
Trademark: While an image may be open access, if it contains a trademarked image, this may complicate use of the image.
Model (Privacy) Release: If the image is of a recognizable person / model, and that model did not allow for commercial use of their likeness, it may complicate use of the image.
Attribution / Terms of Use: While some images may be available for re-use, the person / corporation who holds the copyright may still require recognition when you use an image. Always check the terms and agreements before copying an image.
