What significant contribution did Anup Singh make during his regime in Bikaner which promoted art?

Establishment of a library

Answer: Establishment of a library
Anup Singh instituted a library in Bikaner during his regime that became a repository of manuscripts and paintings.

Rao Bika Rathore established one of the most prominent kingdoms of Rajasthan, Bikaner, in 1488. During his regime, Anup Singh (1669–1698) instituted a library in Bikaner that became a repository of manuscripts and paintings. As a result of long association with the Mughals, Bikaner developed a distinctive language of painting that was influenced by the Mughal elegance and subdued colour palette. According to inscriptional evidence, several master artists of the Mughal atelier visited and worked in Bikaner in the seventeenth century. Karan Singh had employed Ustad Ali Raza, who was a master painter from Delhi. His earliest work represents the beginnings of Bikaner School, which can be dated back to around 1650