Portrait of an artist Bui Thanh Phuong (Bui Xuan Phai's son) by Dang Duong Bang. Dang Duong Bang, who received his Doctorate degree in Denmark and worked at the Danish National Food Institute as a microbiologist, is a self-taught artist who has participated in exhibitions worldwide.

The portrait belongs to a sketchbook which includes a series of impromptu portrait-sketches made by different artists in Vu Dan Tan's studio from 1983 to 1984. It features portraits of regular visitors to the studio, who were often Tan and Natasha Kraevskaia's acquaintances.

Most of the drawings from the sketchbook were produced by artists Dang Duong Bang, Do Phan, Hoang Lap Ngon, Hoang Hong Cam and Phan Thi Thu Ha.