Based on the available information, "J." refers to Junaid Jamshed, a Pakistani brand. The fragrance "Essence" is one of their popular perfumes for women. The 35ml "pen essence" seems to be a specific product size and style, though many retailers list the fragrance in larger bottles, like 100ml.

Here are the details on the "Essence" fragrance:

Fragrance Family: Floral Woody Musk

Main Accords: Citrus, white floral, woody, powdery, amber, sweet.

Scent Notes:

Top Notes: Citruses, Bergamot

Middle Notes: Ylang-Ylang, Lily, Orange Blossom

Base Notes: Sandalwood, Tahitian Vanilla, Amber