If you love nature and overall "elvish" aesthetics, then you should use Art Nouveau elements in your interior design.
While it's hard to change the architecture of your house to suit the style perfectly, you can just add some colors, elements, and decorations to get this effect.
Here are a few ideas for you.
Curved Lines and Organic Forms
Art Nouveau is characterized by flowing and curvilinear lines inspired by natural shapes such as plants, flowers, and vines.
Incorporate these organic forms into your design through furniture with curved edges, sinuous patterns in wallpaper or textiles, or by choosing decor pieces that emulate the natural world.
Floral Motifs
Integrate floral patterns and motifs into your interior design through wallpaper, upholstery, rugs, or artwork.
Look for designs featuring stylized blossoms, leaves, and intricate floral arrangements to evoke the essence of Art Nouveau.
Stained Glass and Decorative Windows
Art Nouveau embraced the use of decorative glasswork, especially stained-glass windows.
Consider incorporating stained-glass panels or decorative windows featuring Art Nouveau-inspired designs.
Ornamental Details
Look for furniture or architectural elements with decorative carvings, inlays, or embossed patterns.
Incorporate decorative touches through Art Nouveau-inspired hardware, such as drawer pulls, doorknobs, or light fixtures.
Art Nouveau Artwork and Prints
Hang Art Nouveau-inspired artwork or prints on your walls to create an authentic ambiance.