The brass Shiva-Linga, the “Linga” or phallus motif has been replaced by a Shiva-head. It is a common phenomenon of Shiva iconography that the ‘Linga’ and his human form, his bust or head, usually alternate each other. in this manifestation of Him, however, this common iconographic practice has become an exceptional and highly skilled artistic endeavor. the Shiva-head here despite that it has been well defined by human features imparts to the viewers the impact of ‘Linga’ and at the same time despite that it is endowed with proportions and perspective characteristic to ‘Linga’ iconography it give a feeling of representing the sublime being. in addition it enhances its votive sanctity for in several Shaivite cults it is the ‘Linga’, that is, Shiva’s essential apparent form, that the ‘Anga’ or his sublime being, is perceived and realized.
(source :- various journals by Prof. P.C.Jain )