study of lights in Caravaggio's The calling of Saint Matthew

study of lights in Caravaggio's The calling of Saint Matthew
Originally uploaded by dibujandoarte

i started this as a quick skecth, but ended up making a study of composition lights and shadows from a book about Caravaggio . I kept on adding roght details for about 1 hour then. In a way I felt attracted to try a new pencil* I had bought last week on this A4 sized sketchbook I did with brown paper.

* lumocolor permanent by Staedtler (waterproof)
link to the originanl image:

la vocación de san mateo - the calling of saint matthew