Awesome work. I love the style, and I think blue suits her well, at least more than that fuchsia hue her magic took on post-season 1, but I'd also like to see yellows and other colors the sky takes up during the twilight itself. This color is certainly more intense.
Is there a right way to do cel shading. I actually follow the steps to make this form an artist called Mark Brunet, and he used several adjustments tricks to create the cell shading look. I used something called posterization for this on a CLIP studio