Pichwai paintings are artworks on cloth or paper that are intended for wall decoration in temples. The Pichwai style originated in the Nathdwara School and the word means 'that which is hung at the back'. The works always depict Krishna and are meant to continue a tradition of visually narrating the life of Krishna. Your painting dates to the 20th century. The style of the figures in your Pichwai painting are inspired by (though not by) the 20th century Indian artist, Jamini Roy. The estimate is based on actual recent past recorded auction sales of comparables.