I love how you re-made the poster in your own style, it looks amazing. You've captured her eyes perfectly, and I love her crown. Her hair is wondrously, perfectly accurate, and I love the way she blends in with her background.
Really, the only negative thing I can see is that the veins in her neck look a tad bit lopsided, but that might just be me.
All in all, though, this is an AMAZING piece. Probably my favorite piece of Tolkien fan art I've seen in quite a while! I hope to see similar pieces from you soon!