Dark feminine fragrance is an aesthetic, not a formal fragrance family. It usually combines softness with depth: floral with musk, fruit with amber, vanilla with woods, or spice with something smooth underneath.
Notes that often fit the mood
Dark berries, black currant, plum, violet, jasmine, orchid-like florals, saffron, amber, sandalwood, musk and non-dessert vanilla can all work.
What keeps it from feeling one-dimensional?
Contrast. Sweetness becomes more interesting against woods or musk. Florals become more dramatic beside spice or darker fruit. A fragrance can feel feminine without being delicate and dark without being heavy.
Where to begin with Romilow
Blackberry Fairy brings dark berry, saffron and musk. Twilight Orchid is softer and floral. Seasonal scents such as Violet Omen can add another darker floral direction when available.