Yeah, it shouldn't be too hard for anyone to figure out where Astrid had hidden herself, after stopping by at the Eiriksson statue for a quick sketch for her letters to Ingrid and the cathedral for a few quick sketches for herself. She'd be spending every other second she could wandering the art museum, contemplating trying to make sure she hit the notable pieces, but finding it was much more fun just to drift around and see where she wound up.
Reykjavík Art Museum