Image courtesy : Saurabh Saxena - https://puratattva.in/ The goddess here is holding Shankha and Chakra in the upper hands. In the lower hands a mortar or a bowl, a club, and what looks like a noose.
Image courtesy : Saurabh Saxena - https://puratattva.in/ Although the top two hands of the deity carries Shankha and Chakra, the bottom right hand here is carrying a beaded garland, which is unusual in the iconography of Vishnu. This particual avatara of Vishnu needs to be identified. The other hand is broken which makes the identification harder.
Image courtesy : Saurabh Saxena - https://puratattva.in/
Although the lute in the Goddess's hand suggests Saraswati, the other hands do not carry the traditional objects such as the book, japamala (garland), and a pot of water. Instead, the top right hand appears to carry a damaru - a small drum (symbolic with Shiva) and the top left hand a conch shell (symbolic with Vishnu.)
Image courtesy : Saurabh Saxena - https://puratattva.in/
Vishnu is traditionally shown sleeping on Adishesha, except here the he is shown sitting on the mighty serpent.