tagged mods like to doubt me so yeah in this case they tag everything as AI on their pixiv
Yeah the older stuff on their Pixiv is very obvious AI stuff. These newer things are very much less so though, especially with the hand drawn aesthetic, including very clear pencil lines. There are some oddities (blurry lines here and there, top straps merging, neck getting wider towards the head and so on), but to me they mostly look like mistakes someone could do drawing by hand. The AI use is more obvious when looking at sequence of images that should be the same character, for example lots of small outfit/hairstyle changes that would not make sense if it was actually drawn by a person.