Very very cute, wasnt sure it was the same person till the oldest ones. Seems to have also gone by otasac_art in the past, has a few more pictures on that instagram at least

Seems to also be "friends" with Kazarinka, who does art of a *very* very similar girl, in a similar artstyle (of the old ones), but is giant fetish. They got a tag here as well, but theres no real proof those two are the same person, they just both like curly hair depressed girl
artist:kazarinka$

Base +16, grianj +6

Kazarinka isnt Casato.

Base +6