Oh yeah, I wasn't the one who uploaded this, but it's driving me up the wall, because I know I have seen this art style before, as well as the signature, but can't recall whose they are. My guess was Slugbox, but no dice. Beside the usual search engines, I also searched e621 in multiple ways, and as far as I can tell, it's not here. The filename is its SHA-256 hash, by the way.

https://media.8ch.net/file_store/9ec9be4844ae15e8a3d3a696edb3962ef4342adc8eab839cc4299168beb24be4.png