Be sure to read the "Terms of Use" or licensing information for any site you use.
While these sites offer free images, there are some uses that may not be allowed. For example, some sites forbid redistributing or reselling images on stock or wallpaper websites or platforms, or portraying identifiable people in a negative, offensive, or degrading way. Images also should not be used with identifiable brands to create a misleading association.
When in doubt, read the "Terms of Use" or license information.
Credit: Viktor Hancek on picjumbo
Source: Vintage Stock Photos