I assume you mean that when you start a new game nobody has any images. If you changed the image folder and tried to load an existing progress, then it may not be able to find the images because it only looks for an exact path.
The first possibility would be that the images are not in the right folder, or the in-game path to the image folders was changed. The second possibility would be that the tags are incorrect. This post covers some of the key mechanics of the IRP mod, specifically the tag filters: https://itch.io/post/493890