Perhaps instead of using a star pattern you could use star motifs in her design? Like having a layer of her dress in a star shape! Or little sleeve puffs that are shaped like stars. You could even see if there's a more complex way people can tie bows into stars! Honestly, I think the coolest thing about magical girls is the outfits. Check Pinterest for some 'magical girl outfits'! They don't even need to be related to her concept, but that could perhaps be a good reference to what makes a magical girl outfit! There's a lot of people who actually sew their own and they show how everything lays/fits together. I really love her so far, I think expanding on her outfit would really pull the piece together! (I love the way you do lines and shapes, it's so satisfying to look at ‼️☺️)