And this is Caravaggio’s rendition of the same subject (1600):
http://www.artchive.com/artchive/C/caravaggio/st_peter.jpg.html
And this is Caravaggio’s rendering of the conversion of St. Paul on the opposite wall of the chapel (1600):
http://www.artchive.com/artchive/C/caravaggio/caravaggio_conversion_of_st_paul.jpg.html