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There's a great website called PIXNIO that has free, public domain photographs you can use for any commercial purpose. In this video I show two examples of how you can create digital downloads from this website.
Using Inkscape, you can create an svg file, export a png file and create high-quality graphics for sale on any digital platform. These also look great on print on demand websites (Redbubble, Teepublic, Merch by Amazon, etc.).
Pixnio is a great resource for free, public domain images:
Inkscape is a completely free vector software tool similar to Adobe Illustrator. You can download it here: https://inkscape.org/