My version:

Reference images:

Analysis (whoo, scientific): This is one of only two hairstyles Galadriel has for the entire trilogy, and this one was only for a few seconds. The hair is parted in the center, wavy and loose on either side. Picture 2 is the only other picture of Galadriel I found where the sides of the hair weren't pulled back slightly. I think it was just for a promo or something like that, because it was never used in any of the movies.

Directions: Just part your hair in the middle and let it fall loose and wavy on either side. That's it!