So, what is chiaroscuro? Here is the Wiki explanation:
Chiaroscuro (English pronunciation: /kiˌɑːrəˈskjʊəroʊ/; Italian: [ˌkjaroˈskuːro]; Italian for light-dark) in art is the use of strong contrasts between light and dark, usually bold contrasts affecting a whole composition. It is also a technical term used by artists and art historians for the use of contrasts of light to achieve a sense of volume in modelling three-dimensional objects and figures. Similar effects in cinema and photography also are called chiaroscuro.
Hopefully, I will be back tomorrow.