They didn't mention using AI in the campaign. I hadn't looked through the current version of the pdf I received from the completed kickstarter campaign, but this picture was in an update they recently released about the project. To me, it looks like AI, but I might be being overly critical.
Here are red flags for me. Most are differences in the reflection:
-The details on the clothes don't match.
-The posture doesn't match.
-The arm/hand placement on the sink doesn't match.
-The details of the room (distance of window from ceiling, tile sizes, etc…) don't match.
-The wallpaper design is a mess and appears to blend in to part of the frame of the mirror.
-The faces look like a common AI style.
It didn't test positive for a watermark, but that doesn't mean much.
After seeing this, I checked out the artist's IG/Artstation. Some of their stuff jumps out with a few red flags, but nothing big. Mostly just typical things that are easily dismissed. As I am looking through the PDF of the current version of the book, I am questioning a couple of things, but nothing huge there. Most of the art is in a low detail style that easily explains inconsistencies and perspective issues. This image does stand out the most of anything I have seen yet.
If it is, then I am sad about it because I am really excited for this project, and it wasn't cheap since I pledged the highest tier.
*Edited for clarity and to remove language that made it sound like I was stating that the artist was definitely using AI. That was not the intention.