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I just went back to Pixabay and saw what I was doing wrong! On some of my searches, I only had returned results that were in the Sponsored line. These were watermarked and not free to use! Hmmm, thanks for opening up a new avenue of picture hunting!

I use the Google Search tool for "use" restrictions. I don't trust anything off Flicker, admittedly (though I could be wrong there), but I usually have a number of free image sites to choose from.