Which one would be correct :

Esta es una escultura de deity.
OR
Esta escultura de deity.

Thank You.

Demonstratives are this & these / that and those

Ésta es una escultura de deidad = This is a sculpture of deity (or a deity sculpture)

Esta escultura es de deidad = This sculpture is of deity.

Esta = is the demonstrative "this" (adjective) modifying a feminine singular noun.

Ésta = is the demonstrative "this one" (pronoun) replacing a feminine singular adjective and noun.

Your instructions could have been clearer!

Sra