If you want to prove that it's not I suggest posting any proof on chain. It looks like AI to me as well. All the shapes are in the exact same spots and there's no variety in the brushstrokes.
Of course I'm not an authority over you and you don't need to do what I say, but without any concrete proof to the contrary any posts in OnChainArt will be muted.
Thank you for your feedback. I do understand your concern and I realize now how irresponsible it was not to pot the source of a free stock photo.
I will make a post within the next 24 hours. I would make a post right now, but the movement restrictions in my country prevent me from doing so, and thus making the hard drive containing files unreachable. This is why I will have to wait until morning. You can expect the post to be published tomorrow.
Thank you for understanding.
Best regards.