Features of the classic interior style:
1) Symmetry and order: Strict proportions and balanced elements.
2) Natural materials: Wood, marble, silk, and other noble textures.
3) Calm color palette: Light tones with accents of gold and dark wood.
4) Exquisite decor: Moldings, columns, bas-reliefs, and decorative details.
5) Elegant furniture: Carved details, soft upholstery, classic shapes.
6) Luxurious lighting: Crystal chandeliers, candles, and elegant sconces.
7) Decorative accents: Mirrors, paintings, curtains, and antiques.
8) Luxurious floors and rugs: Parquet, marble, patterned carpets.
Source: https://build2last.ru
Pikabu: https://pikabu.ru/@Build2Last.ru
Another post in Telegraph: https://telegra.ph/Osobennosti-klassicheskogo-stilya-v-interere-11-24