ChatGPT straight up plagiarized your work. I asked ChatGPT to make me grim dark black and white characters for a souls like solo RPG I was playing.
Straight up made this nearly shot for shot. I even printed the stuff out.
https://imgur.com/a/RFrlVpI
If you know the other artist, please let them know. I will be buying your art when I get paid. Your stuff rules.