This is a vintage 20th century conte crayon sketch with grid form by British female artist, Madeline Rachel Wells. The grid form indicates this was an idea sketch that could eventually be used to place figures in a finished painting. These are otherwise known as 'preliminary sketches' and it shows her academic training. Madeline Wells is a moderately listed artist whose finished paintings have sold at auction. Preliminary sketches do not sell for as high as finished works. The estimate is based on actual recent past recorded auction sales. Retail prices may be higher and vary.