The plural noun 'sculptures' is a common noun, a general word for three dimensional works of art; a word for any sculptures of any kind.
A proper noun is the name or title of a specific person, place or thing; for example "The Thinker" by Auguste Rodin or "Christ the Redeemer" in Rio de Janeiro, Brazil.
Common
Yes, the noun sculptures is a common noun, a word for any sculptures.
Yes, the noun sculptures is a common noun, a word for any sculptures.
proper
As a name of a road , Park Avenue', it is a proper noun, and both words star with a capital letter. However, when used separately, as 'the park, or 'the avenue', they are common nouns and so not need a capital letter.
They were made using chisels and hammers. Common stonemasonry.
A lot of Barbara Hepworth's sculptures look like funny shaped rocks if you look closely (squint, it helps to see detail!).
common
common and proper
It is a proper noun, because it is the name of a specific thing.
common
it's a common noun. a proper noun would be Spider-Man.