You can use a Google Maps image if you give attribution in the way they want it.
Found on Permissions - Google
Using Google Maps, Google Earth and Street View
USES ON THE WEB OR IN APPLICATIONS
If you’d like to use our Content in a web-based project or application, please first review the general guidelines at the top of this page, especially with regard to attribution.
Google Earth images
We know the imagery in Google Earth, both current and historical, can provide useful visual context to news websites, blogs, and other educational sites. And often these sites want to use the imagery found in Google Earth as still images, both as-is or annotated with additional labels and features. You may use a handful of these images in a news article or on a blog, just please be sure to follow our attribution rules. Note that Google Earth Pro allows you to export high-resolution JPEGs—particularly handy for these projects.