I aim to use only photos or images with permission or that are clearly marked with a creative commons license. My go to-sources are Unsplash and Pixabay.
I usually use CC photos you don’t need to credit, but I try to remember to do it, anyway. (And don’t always succeed – sorry.)
If you for some other reason don’t want me using a particular image or photo, CC-licensed or not, please contact me so I can remove it right away:
Chris AT shadeofthemorningsun DOT com