She has been depicted here as visualized according to her sadhana, which says :
'She has three faces and eight arms. Her faces are slightly wrathful in appearance, but each face has three peaceful eyes. Her two main arms hold a double thunderbolt (vajra), her upper right hand holds a small image of the Buddha, her second right hand holds an arrow, and her lower right hand is palm up in the charity mudra.'
'Of her left hands, the upper one holds a lasso, the one beneath it holds a bow and the lower left hand holds the long-life vase filled with nectar.'
She is very youthful and graceful, and wears many jeweled ornaments and silk robes. She is seated cross-legged with her legs closely locked, and the soles of her feet apparent. Her large earrings are shared between her front and side faces, and each side face has one earring in back. Her hair is up in a double knot.
This description by Nitin Kumar.
Getty, Alice. The Gods of Northern Buddhism. New Delhi: Munshiram Manoharlal, 1978.
Lipton, Barbara, and Ragnubs, Nima Dorjee. Treasures of Tibetan Art: Collection of the Jacques Marchais Museum of Tibetan Art. New York: Oxford University Press, 1996.