Answer:
The three African portrait heads are:
Nok Head: A work of stylized realism made from wood and ivory by an unknown artist from Bantu-dominated Central Africa. It is considered one of the finest examples of Bantu art in Central Africa.
Benin Head: An idealized portrait made from a combination of wood and ivory.
Male Portrait Head from Nigeria: A carving made from local materials with an expression that ranges from realism to abstraction.
The Nok culture may have emerged in 1500 BCE and continued until 1 BCE. The Nok people may have developed terracotta sculptures as part of a funerary culture. Nok sculptures often have:
Elaborate hairstyles
Heavy jewelry
Outlined, semicircular eyes with pierced pupils
Triangular or oval-shaped eyes