Step 1: Understanding the Concept:
The question identifies a specific sub-school of Rajasthani miniature painting known for a very particular and elegant style of portraiture.
Step 2: Detailed Explanation:
The Kishangarh School of painting is renowned for its lyrical grace and highly stylized portrayal of human figures, particularly during the 18th century under Raja Sawant Singh.
The masterpiece Radha (Bani Thani) was painted by the artist Nihal Chand.
Bani Thani was a singer and poet at the court of Sawant Singh; her features—elongated eyes, pointed nose, and thin lips—became the aesthetic standard for depicting Radha in this school.
This school is distinct from others like the Mughal (realistic/imperial) or Kangra (Pahari style with softer lines).
Step 3: Final Answer:
The masterpiece "Radha (Bani Thani)" belongs to the Kishangarh School.