I saw this on Instagram and it won 2nd place. The 1st place went to a really terrible powerpuff girls cosplay. It only won because cartoon network built a brick wall between Steven universe but loves their awful shows.
This is Coser Tiêu Nhu. She's a Vietnamese cosplayer (or, at least, I think she is Vietnamese) and wow, just wow. It's creepy that she looks literally like Mavis from Hotel Transylvania but it's so perfect and cute!