Portrait of Thakur Umrao Singh ji, attributed to the artist Rahim ji - Bikaner, early 19th century

Medium: Gouache on wasli
In a hybrid style typical of Bikaner at the time after large scale migration of artists from Jaipur who by and large continued to paint in the Jaipuri manner.
Rajasthan's thikanas (feudal states within a kingdom) were granted with the title thakur (equivalent to a lord) by the maharaja in recognition for loyalty and service.
Source: indianminiaturepaintings.co.uk