https://blog.erlend.sh/credit-your-genai
It's bad enough that GenAI mashes together thousands of similar drawings and repaints them at your behest with the signatures of its contributors scrubbed out, their record of work erased. Don't add insult to injury by omitting any credit of the machine assistance whatsoever, as if this work was painted by your hand.
Whenever I see an uncredited image online, I assume foul play. Every uncredited image is non-consensual exploitation of art.