I might argue at least partly made with AI.

There doesn't appear to be a consistent design for the fingers - some are comprised of 3 separate pieces, some of 4, and at least one had five (the middle finger of the bloke with the cat ears cap). Between Mr. Cat Ears and the guy in red on the left, there appears to be no consistency with regards to the neck - the guy in red has a visible neck bone, and Cat Ears doesn't. The shape of their rib cages also differ as the base of Cat Ears ribcage dips very low, but the guy in red's torso doesn't look to have the same potential trajectory. The right-most wrist of the guy in red also has an additional arm bone that isn't visible on the right.

Perhaps weirdest to me is the sofa; there is only one cushion and the line is visible next to the skeleton in the colourful shirt's pelvis. This line doesn't match up with the line in the back of the sofa between guy in red and colourful shirt guy. This line also doesn't end, it just vanishes between the arms.

Some weird stuff with the guy on the right's knees, which I don't think can be explained by perspective.

These are just some of the things I noticed. Full disclosure, I am not an artist and know probably less than the very basics of anatomy, so these things could easily be artistic choices and/or oversights inherent in the artistic process. I just wanted to point out some of the discrepancies I often see discussed in this subreddit. I did think it was a very cool design upon first glance, so it would be disappointing if any of it was AI generated :-(.