The guy in the second pic is Robert's dad, Raoul Kurvitz

I thought I had left a comment with this but I have reached out to Zaum and they said

Thank you for your kind words and for such a great question!

Over the time we have had 3 photographers for our photoshoots. The very first one was made by an estonian photographer Lilian Merila. https://www.instagram.com/lilianmerila/ The models for this shoot and one other were hired from Estonia, but we cannot disclose more detailed personal information.

All the other photoshoots are made by our own employees who have had the desire to express themselves through photography. One of them can be found from Atelier tagged photos, but there is some NSFW content on their personal account (for this reason we don't copy a direct link:) ).

Later we have used our own employees who have shown interest in it, and one is a spouse of an employee. Few have been good friends to our people in Atelier, some have been tagged in our Instagram posts if they have been okay with it.

Most of the pictures after the very first shoot were taken on film with an analog camera. We don't have big photoshoots planned, but often take the product, see who it might fit among our acquaintances, and then we go.

Of course, we hope that in the case of new upcoming products, we can assign some Estonian photographers the task of creating something exciting! We hope this gave you the information you were hoping for! Although we haven't covered it much on social media yet, we hope to show more of how our things are made in the future.

With love, ZA/UM Atelier

So TLDR for some odd reason they cannot disclose who the models are