This page of our AC Valhalla Dawn of Ragnarok guide shows the locations of all Cosmetic Schemes appearing in Eitri region.
Location: Northeast of the city, right next to the border with Svaladal.
The scheme is pinned to a wooden column, inside the building. To get to it you have to jump on a wooden shelf.
Location: southern part of the city.
The scheme is hidden in the building, in a small gap in the floor. To get to it you have to move the shelf that covers it