I use Standard Notes[0] although it doesn't support images. Evernote supports images, but Evernote isn't as private as Standard Notes. There is also Joplin[1] if you really need images, and you can either self-host it or use their cloud[2] offering.

[0] https://standardnotes.com/

[1] https://joplinapp.org/

[2] https://joplinapp.org/plans/