You know the story of the young Count Zinzendorf Count committing his life to the service of Christ after seeing the painting Ecce Homo ("Behold the Man") by Domenico Feti and here is one version of the painting.
Domenica Feti (1589 – 1623) painted many variations of Ecce Homo now in museums across Europe, such as this version in the Galleria degli Uffizi, Florence:
The version that Zinzendorf saw in Dusseldorf may be located in the Bayerische Staatsmuseum in Munich, but I was unable to locate that version online.
Ego pro te haec passus sum
Tu vero quid fecisti pro me
"This have I suffered for you; now what will you do for me?