I don't put this on my artworks at all, but:
You do not have permission to replicate, copy, alter, or claim my art as your own.
You also may never sell or trade any of my artwork.
However, if you ask me politely through my comment section or email me, I may consider allowing you to use it/them. BUT, you need to credit me and also give me a link to see what exactly you did.
Thank you for your attention :)