You ask about photomanipulations, right?
So on DA there are special category for free stock images. You can find them here:
www.deviantart.com/browse/all/…Just need to click on Deviantart logo to go to the main page, then you can type in search button word of image you needed. Then click on "Resourses and Stock Images" category - and all of this image you can use
But be attentive - different deviants give their work with different rules. Often they wrote about rules in description of their image. I think if you are not sure - comment or note them and ask about rules
Also often all images are free but you need to credit owner in description of your photomanipulation
Hope I answer on your question)
And thanks so much for the watch!!!!! I really appreciate it!