I would like to know how to do it, since in the editor I go through all the procedures, I went to "Use custom images", I changed the size of the file to 2000 x 748, I believe it, but even so the error "Couldn't load image, was it converted? named properly?" still appears

The final step would be to run the converter application which you can find in the editor folder. Once you run it, the busts and all other custom images should be visible in the mod.