I randomly opened up Pinterest this morning and saw 2 images I have never seen before.
They are clearly by the same artist. Reverse image search on Tweek turns up nothing but 2 Pinterest pages.
The Craig one however offered a link to a drawing from 2015 Korean site (https://www.dogdrip.net/78975782) that looks like it is either an original drawing this Craig came from or is in fact derivative of this Craig.
It is this type of Creek fan art history/authorship drama that drives me bonkers.
Artist: Undetermined | Drop a comment if you know!