I am not sure, but by the technicolor seizure rainbow I would say is Gullacass os something like that
Seriously? This artist is that obscure that no one knows anything?
Gullacass didn't do it btw, thanks though.
I tried a reverse image search on Google, but there was only one link not to Pawsru. That link wasn't any help, it just lead to another image board.
Aww, I was hoping someone would bring up something...
Oh well thanks for trying.
It's Neolucky/Luckypan. Signature matches perfectly, as does the style. Where exactly this was posted I don't know, and it doesn't appear on e621 under her name. Either the image was given to a few specific people and subsequently leaked, or it was posted through normal channels and simply slipped through the cracks of the internet. Could ask her.
Awesome, thanks for the info.