IDK- I suppose what bothers me about the art is the abrupt change itself. It almost feels as if someone else entirely was doing the drawing. Just feels odd after 60+ chapters in one style, to suddenly change the look. Especially if we're now going to get an extra here and there done in the new style and then back to the old, only finally to revert to the new. In most cases where the art style changes it happens gradually over time. I just can't help but wonder if it was impossible to have finished this manga in the old style and saved the new for new projects?
Besides I'll admit that I'll miss the fact that sensei's style was so distinctive and recognizably hers!
The change hasn't been abrupt. It has evolved gradually. The art in volume one is different than the art in volume three and the art in volume five continues the evolution away from the angular style of volume one. IMO, the art style has been pretty consistent since volume six, more consistent than it was over the first five volumes.

This was a cute and entertaining extra. Buuut.... (and please don't hate me for saying this) it's been so long since we saw update for the story itself rather than extras, good as they are. Also has the art changed?