Anyone know how to do this?
I am trying to find the way but looks I am losing something.
I just want to add my own list of Actors / Actress images form local source manually.
Is this possible? I don’t like the grey circles without photo 
Thanks in Advance!
Check your agents.
Settings - Server - Agents - The Movie Database - The Movie Database (actual agent) .
Click the cog to flip the setting to “The Movie Database”. IMDB will not return images.

With this done (at the library level), now we go back to each Library (global level) and set it back to Plex Movie
(no images from IMDB)
Now update the library.
@emilio_n said:
Anyone know how to do this?
I am trying to find the way but looks I am losing something.
I just want to add my own list of Actors / Actress images form local source manually.
Sorry, but this is not possible. Plex has not exposed a way to manually edit cast info or images.
Is this possible? I don’t like the grey circles without photo 
If you are not seeing cast images, it sounds like you are using the Plex Movie agent but have set the “Cast List Source” to IMDB. IMDB does not provide Plex with cast images, so there will not be any images. To get images, edit your library (see images posted above by ChuckPA) and change the source to “The Movie Database” then refresh your movie. If you need to update your entire library, you will need to select “Refresh All” for the entire library.
Thank you very much for your answers and sorry to answer too lata! 
I have a lot of strange nd local actors the didn’t appears in The Movie Database. I hope I can find a solution in the future to add the pictures by myself. For the name of the actors, I edited the metadata of the file and at least this works. For the image, I suppose no solution yet. Thanks!