My version: Not here yet!

Reference images:

Analysis (whoo, scientific): As someone who is always frustrated by what to do with her hair while wearing a helmet, I always kind of wondered how Eowyn had her hair. As you can see in the pictures, it looks like it was twisted inside the helmet (you can see it untwisting as she pulls the helmet off). Her hair is parted, as always.

Directions: Part your hair, twist it up inside your beautiful Anglo-Saxon helm, and you're good to go.