I got my images from here but just bare in mind that the folder has spoilers all the way to the latest JP release (5.2.1) and the first couple images on the story folder does have major spoilers for the latest story chapter but are otherwise generally organized by chapter; same with the events.

The sprite sheets also do have spoiler characters in the listing due to how they're set up here as well but other than that, have at it. I do plan on iconing the rest of 31-A hopefully soon though.