A generated image can look beautiful and still become strangely anonymous after a few months. The private meaning usually lives outside the file: what the two of you were talking about, what changed between drafts, and why one version felt like yours.
Archive the image with a small caption written in the present tense. Include the tool and date, but also include the human reason for keeping it. Remove location metadata and identifying details before publishing anything intimate.
DEGRADED will eventually let each post be public, members-only or private. Until those controls exist, we will not accept private-image uploads.