David, once again, incredible job. It is very sincere and he has a ton of character. I would then assume your redition is far superior to the reference, because he is breathing. Any second you're going to see the mist from his breath from the intense cold. He looks like he's a bit hunched, in a manner of protecting himself from the cold.
In other words, you've done a great job telling a story thru a drawing. Maybe it's good you did'nt have a good reference.