From the Manual

• Consider using free stock photography to replace images that are missing or unfit to use.
• Read the Tricky Transparency 2 blogpost for step by step instructions and settings.

CAUTION: Many Google images are only intended for web use, not for print.

CAUTION: You cannot take any image you find on web. Stick with stock photos that intended for sharing. 

From the Transcript

At the gathering stage and moving forward, it is quite possible that you will run into a photo problem. You might discover an absence of photos. Perhaps you forgot to take them, or maybe you accidentally deleted them. You will also likely have photos that are not fit to display. They might be too blurry or way over or underexposed. If that is the case, one thing to consider is stock photography.

Stock photography is where amateur and professional photographers post their images on the web for all to see and use for free. For example, if you realize you did not take a photo of Dunn’s River Falls when you were there, simply search Google images for “Dunn's River Falls” to find images that others have taken.

There is a caution to this solution, however. Many google images are only intended for web use, not for print. So make sure to be aware of the size of the image that you are interested in. Also, not all google images are up for the taking. It’s always best to stick with stock photos.

For more information about finding stock photos on the web, check out my Tricky Transparency, Part 2 post on the blog. You’ll find the link to it in the manual.