I asked LUMO about the images below gallery, where those comes from, It answer the following:

lumo created images are shared to the community in the gallery?

Checked Proton knowledge
No, images created with Lumo are not automatically shared to a public community gallery.

Lumo is designed with privacy as a core principle. Images you generate or upload are:

Private by default: They are stored with end-to-end encryption and are only accessible to you.
Not used for training: Your images and conversations are never used to train AI models.
Controlled sharing: You can choose to share images with specific people via Proton Drive shared albums or by generating a password-protected link, but this requires your explicit action. There is no public feed where your creations are posted for the general community to see.
While Lumo features an inspiration gallery within the app to showcase examples of what can be created, this is curated content provided by Proton to inspire users, not a feed of user-generated images.

If this is true, I would like to have this clarification in some place on the image creation page, to ensure to users those images are not from its gallery.

In other services your images created, are everyone images.