If the images are public domain (and I would think they must be by now), then the blanket statement should be fine. If you get the images from a website, the website may have stipulations about how their images may be used and how to cite. I am not certain that something being on Wikimedia Commons automatically means it's public domain, so see what their fine print says.
"Our aim in Education is to give a Full Life." -- Mom to 4 AO Graduates, Grandma to 3
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"Practically, nearly, almost and in all ways visible to normal mortals Invincible" (due to the diplomatic immunity of Admin.)