I think this tweet is the source and there's no watermark or signature. It's got the same funkiness going on at the bottom where it seems like there's another layer (or maybe even the same exact illustration) poking out below. Not sure what's going on there, but I doubt it's intentional.

you can compare from the source, i think its twitter https://x.com/G_R_S__/status/1835415460671582336