My best lead was a picture I found in a book which is apparently an authentic portrait of Saint Lawrence by Pietro Labruzzi (assuming my internet translator translated the German correctly). Unfortunately, the best I could find was a cropped black and white version of the painting. I think it is somewhere in Tuscany.
Anyway, you can read about his life at Catholic Encyclopedia
St Lorenzo da Brindisi
A quick anecdote from his entry in the book "The 33 Doctors of the Church." (Don't you wish some priests would follow Saint Lawrence's example?)
When preaching, he [Saint Lawrence] had a [religious] Brother sit behind the pulpit to watch the time and warn him with a pin when he was going too long. Sometimes the Brother had to draw blood to catch his attention.