^Since you pointed it out, I didn't even realise Arti's take on Rowlet's tail was kinda long until I looked at the official art again. (I kinda miss the gender differences tbh. The subtle ones, I mean)
Regardless, basically what Sir Blaziken said, this is very well done (and needless to say, super cute!) I think what I like most about it is the detail you gave to the wings; it helps Rowlet's wings have a nice interior design to begin with, but your pic pretty much drives that point home, haha.