Yep, that worked, it just inexplicably changed all the images one day. There's no way I did that by accident, it was a lot of images, it was just a sea of the same image.
So I guess Evernote will extort €13 from me every time it messes up a note. Uncool.
Also for anyone reading this, if you do a subscription on iOS, the place to cancel it is the App Store app, then your little avatar on the top right, and then there's "subscriptions" or "manage subscriptions" near the top. I refuse to believe that there was no way for Apple to let Evernote display the subscription and ability to cancel it within Evernote. Uncool.
Gazumped, thanks for the assist. Cool.