SilverStraw
To be general, lack of control. My first attempt was a total failure, because I don't know ControlNet at that time. After applying ControlNet, I can control the edge of different attachment's edge. But still, edge is ambiguious hint, and sometimes diffusion misunderstand it (eg. flesh color on clothes is misunderstand clothes to body).
Also lack of control of consistency of different frames of animation. Do you notice that, when Emiliya raise her left arm, the color of the sleeve's changed? I have no way to tell diffusion that, they should be of same color pattern.