I would offer the idea that it is not Art Nouveau influenced at all, but is, instead, pure Arts and Crafts Movement, since the roses are drawn very much in the style of Charles Rennie Mackintosh
Of course, there is a lot of debate about the relationship between Art Nouveau and the Arts and Crafts Movement, especially in how they simultaneously influenced and opposed each other. If you’re not familiar, Arts and Crafts is very much like Art Nouveau, but…sturdier
sorry XD I had an Art Nouveau phase in college that was completely pushed aside, aesthetically, when I learned about Arts and Crafts. The politics of it? um. kinda reactionary. But, ooh, the shapes.