From a drawing point of view, i think the only thing missing from the diadem for it to look better is the light reflexion in the gem. The gradient is really well done, but I suppose it's some kind of glad/gemstone (not a big HP fan) ? so there should be a bright white spot. it would really make it stand out and give it dimension! ([link] like those) It's a really lovely makeup, the feathers look awesome and I love the lashes
Eh, the movie is just one interpretation. I really like how you made the diadem a golden bronze. It really brings the book colors back into it. And I love how you didn't just stop at the face; you kept the look going into the collar bone and the hair. The hair especially was a nice touch.