Paul Newman looked like
http://www.boxing.com/villain_to_hero_how_jake_won_new_york_hearts.html
I found this picture online of one of Jake LaMotta's fights with a fighter named Tiberio Mitri. Check the picture out. His resemblance to Paul Newman in Somebody Up There Likes Me is uncanny. It's unbelievable.
Check this one out too:
https://www.google.com/search?q=tiberio+mitri&biw=1360&bih=545&source=lnms&tbm=isch&sa=X&ei=Cc8JVYf5L8ewsAS-2oKoDQ&sqi=2&ved=0CAYQ_AUoAQ#imgdii=_&imgrc=iGmhkdBSm7ZjHM%253A%3BAsUS6xmQewFzvM%3Bhttp%253A%252F%252Fupload.wikimedia.org%252Fwikipedia%252Fit%252F4%252F48%252FMitri1950.jpg%3Bhttp%253A%252F%252Fit.wikipedia.org%252Fwiki%252FTiberio_Mitri%3B250%3B297