I see the girl as the personification of NATURE or even of the TEMPLE of NATURE. Detachment look, Nirvana tells about the frailty, the fragility of all Earthly things, the inevitability of loss, and at the same time, on the immutability AND eternity of the Spiritual Beginning.
Like falling cherry blossoms symbolize the inevitable departure from existence, but at the same time, as well as everything in NATURE confirms the inevitability of Rebirth, the cycle in NATURE ( after all the flowers fell off, the leaves appeared and etc... in terms of development).
For me painting is the image of the EARTHLY and the SPIRITUAL. The image of the Girl Earthly, bodily.
Her look, depth, Nirvana, Spiritual, Eternity, the pettiness of the Earth. Vanity of vanities.
Falling flowers - the fragility and frailty.
General background, details of the picture, in my opinion - is a combination of the Earthly and the Spiritual, ETERNITY, NATURE, WORLD (globally).