What materials are being used in Art Nouveau architecture?

Hello, I’m a brand new structure pupil, and I’ve been wanting to construct a mannequin impressed by the Artwork Nouveau model. My one limitation is I can’t use bricks on the outside facade. So, what different supplies have been utilized in Artwork Nouveau facades that I’d be capable of replicate in a mannequin? And what supplies are being utilized in these examples of Artwork Nouveau structure?