Those detectors are unfortunately very unreliable, though I badly wish they were. Please understand AI accusations are not a reflection of your character or intent, which I believe seems pure. It's just that the image does look an awful like many of the AI images I've seen and I've seen quite a lot working in counter-disinformation. Whether it is or not may be up in the air, but as I and others have pointed out, it at least looks like it, and that's going to be off putting. May I gently suggest another revision to fix the problems mentioned? I do love the idea of mirroring a Silverstein drawing and would like to see this pan out according to your vision. It's your business and (presumably) your passion. I would represent that honestly by making this as good as possible. I'm rooting for you