Thank you for submitting your item for appraisal. These appear to be two pastel drawings by David Mbele ( 1942 Johannesburg ). The artist has been exhibiting since 1981 and is known for the curvelinear lines he uses to portray the aspects of the human figure. His works of art are available online for modest prices.
The estimate is based on similar drawings offered or sold at auction. I hope you found the information provided helpful.