Originally discovered in someone's tweet, found to be a bad_id by saucenao, obtained a PNG from rare-gallery.
What was the original image format? No clue, but I'm told PNG is the way to go. And twitter seems adamant on jpg, so it's reasonable to assume it could've been PNG before.
Worst case- This is upscaled. The artist wiped their works clean, so there's no way to know sadly.