One of the more famous Cuban posters, this 1968 poster by Rostgaard for a Santiago Alvarez documentary makes use of Korda's iconic image of Che Guevara. Hasta la Victoria Siempre (Onwards Forever to Victory) is Che's declaration of commitment to the revolutionary struggle. It's a simple pop-art style poster that places Che's iconic image in a heavy-bordered black box - a common method of displaying images of the dead in some cultures.
The film was made after Che's death to tell the story of his efforts in Bolivia to highlight the struggle of the opressed indigenous peoples and to foment revolution there. The 19 minute documentary was made quickly and makes use of photographs of Che's experiences in Bolivia cut with speeches and footage of him working among the people.
Notice the tape damage top and bottom of this poster which was given to an American visitor by Santiago Alvarez in 1968.
Here's the film: