Nancy,I love Caravaggio's work. This detail makes me want to see the whole painting. Do you know the name of the painting?
I got it from Wikimedia Commons ... they had this detail, and a bit larger image that wasn't perfect (you'll see what I mean if you can get this link). Here is the link to the larger one: http://commons.wikimedia.org/wiki/File:Deposizione_1602_%28particolare_1+2%29.jpg Both seem to be part of a larger work stil.??? r maybe not? I tried "Tineye" and came up with just these. Do you know tineye? My son led me to it. You just type tineye into Google, and up comes a free reverse image search. It helps find sources and artists if we don't know them.