Copying Leonardo

I'm reading about Michelangelo (The Agony and the Ecstacy) but got a neat little book about Leonardo da Vinci on the side and thought I'd copy a face from one of his pieces.  I didn't know but they were contemporaries!  They competed against each other even.  Leonardo was a painter who was forced to sculpt and Michelangelo was a sculptor who was forced to paint, the Sistine Chapel!  They both worked incredibly hard at their skills and both secretly studied cadavors.