culptures of Ekajata (or Ekajati), a blue form of Tara, are rare and even more so when depicted with a peaceful face, in which case she is a meditational deity who may have 2, 4, or 8 arms. She is identified thanks to her very long hair, usually coiled and piled on her head as above, and typically has a third eye and wears a tiger skin dhoti and a snake as a sacred thread. The above displays bodhisattva jewellery typical of the Malla period, her main hands hold a skull cup and a flaying knife, the upper left hand holds a ritual staff (khatvanga), the other arm is missing.
This is the one-head and two-arm form of Ekajati, holding a skull cup and a flaying knife.
18th century, Nepal, unidentified goddess, copper alloy, published by Eleanor Abraham on http://www.asianart.com.
It is unusual for a female deity not to have a crown or a tiara or some other kind of adornment in her hair, except for green Tara who is sometimes depicted her without a headdress and seated with her legs as above. But Green Tara always has one or both hands doing a symbolical gesture. What is even more unusual is the way her long hair is gathered into a chignon at the back of her head rather than on top.