RAUL LARA's Original Sketches circs 1980's

The images above are of an original sketch by a welknown Bolivian artist. He was born in 1940 Raul Lara Torrez in Bolivia and died in 2011. Accordingly Raul Lara is considered to be Bolivia's best in his artistic expression. He has been classified as Bolivia's Van Gough.
This sketch was an attempt to insert an illustration in one of Latin America's great literary geniuses, namely Gabriel Garcia Marquez.
This is evident by the writing on the back of the sketch.
I welcome any and all information pertaining to this item.