My version: Not here yet!

Reference images:

Analysis (whoo, scientific): The basic Eowyn hairstyle, only with a circlet over the hair holding it back a bit. The hair is down and wavy, as usual.

Directions: Part the hair in the middle and leave the rest down and wavy. Put the circlet on over the hair, making sure to keep the hair above it smooth and not to pull it down so tightly that it creates a poof on top. That's it!