The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]
gif of NICER with caption "This time-lapse animation shows NICER being extracted from the SpaceX Dragon trunk on June 11, 2017. Credits: NASA" at https://www.nasa.gov/press-release/goddard/2017/nasa-neutron-star-mission-begins-science-operations...
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