The anatomy and design is super cute! normally i would say that the pose is too stiff but in hollow night usually the character stands still and does things in a flash( the main character anyway) so i would say you did a good job on that as well ^^
I must also note, that im very impressed that you managed to use gradients successfully without it looking tacky.
However, if you draw even on hollow knight characters in the same kind of poses, id heavily recommend to look a figure drawing examples ^^