It's not a bad cosplay. It's definitely up there with one her best (in terms of the nu-twitch-patreon-bonbi) cosplays. But it's Nezuko. She isn't entirely difficult to cosplay. And there were so many opportunities to do something 'original' that would just make it cuter.

Something like the middle tok on her page. She just reused the same camera angle. If she wanted to portray Nezuko properly, she would have had some camera angles where it was raised higher and tilted downwards to accentuate her 'shortness' (both Bonbi and Nezuko).