I’m not a lawyer, but here’s my understanding of it:
Personal use means personal use. You can do anything you want to the images, but you can’t publish them in any way as part of your project, regardless if you earn profit.
If you are looking at the license of a specific image, look for “commercial use” which will specify if you are allowed to include them in published projects or not. If not specified, that means you can’t use them.