"Whose" is a possessive pronoun. It lets us know that the sculptures belong to someone.
In the book Bud, Not Buddy by Christopher Paul Curtis, there are four main themes. They are the importance of family, hope and perseverance, and the effects of racism.
Not for sure what your paragraph is about, but here a few words for you :)
Sui Generis: being the only example of its kind, unique
Profligate: using money, resources, etc., in a way that wastes them
Obduracy: refusing to change in any way
Obstreperous: very noisy or difficult to control
Brian smith, he knows it all