First of all, I'd like to thank you so much for telling me this. About this case, I'm not sure if he/she is the same person who asked me for my permission because I've also given someone else permission but with another work-id. So... maybe this person doesn't ask me for permission on my work id=50423787. I've signed my signature on every single of my work so I think it's okay not to take it down. Anyway, If it's not bother you please tell them to send me a message to ask for the proper permission and please feel free to contact me anytime if they want to re-post my art-work. I really love to share