May I include CCO/Public Domain Stock Images on my file on Graphicriver?

I am making flyer with double exposure style, there is model image with background image files from unsplash, both image have CCO license/public domain, so may I included them on my file?
thank you

hi , normally u can include public domain items, as they are images that considered as begin “free for all” so to speak, the right have normally ceased after being exploited for a long while or something like that