It's the work of an AI (I don't remember which one; I used several at the time). Unfortunately, I can't handle the visual aspect, and the few people I know who could do it are, well, the usual: family, work, etc. It's a complicated matter, to be honest. I first tried using free image banks, but that approach is even worse. Finding something that perfectly matches what you're doing or have in mind when it's a personal project is difficult. What I will do based on your comment is edit it myself at some point.
Now that I'm writing this, I'm wondering if I should warn people about it. I know some people are very reluctant to accept AI-generated content.
By the way, just in case anyone gets the wrong idea, this is the only work in my project done with an AI, along with the music, although it's actually mine. It all started with a whistle I recorded, and an AI orchestrated it. :-)