I actually tried to contact you yesterday but then I saw I was banned which is actually a sad thing.
I'm more than happy to solve this situation with small blood any time.
I'll just re-type something I had to say, okay?
As an artist, I do not understand complete copyright removal, whatever the situation may be. I've had some issues where mutual hate and closed species are involved, and it just ended peacefully. We never get in contact, they keep the closed species characters and do not try to remove the credits or steal the species. I wish it could be that easy for you.
If you ever consider changing your character's species I'm more than happy to implement the changes to the reference.
I also thought to offer making the copyright very very transparent somewhere on the image so you won't pay any attention to it. You should've said something about it when I sent you the final variation.
So to say, you have my permission to use the reference with the due credits given somehow, I keep telling about it within our PayPal discussion or here.
I might have been hot headed to take the image down without any warning, which I'd like to apologise for if the situation solves.
I'm also really sorry to hear you're being attacked in twitter like this. I don't think this is okay, but some people said everything about it above, I don't think I should repeat it.