Colours are phenomenal. Pose and shape look brilliant, too~
Question: The feather shadows on her hair in the top -right. Of the 6 visible feathers behind her head, are only 3 of them supposed to cast shadows? Feels like the fourth should have had a distorted shape trailing off the right side of her head.
With that asked, I'll also comment on how amazing the shading is, especially along her arm where it is exposed to light then fades down past her elbow. XD
Awesome piece, I'm a big fan of Koyorin, too :)