That outfit is really cute, I like it in red the most. Not sure how did other promotional outfits fare with fanarts but I kinda hope this one gets some art too.
Also, despite knowing that Tianyi is super popular in China I still can't help but be surprised when she gets big promotions like this lol. I guess because it's usually expected for Miku to be marketed big, but it's great Tianyi is getting this kind of promotions too.