Well, I think you executed this very well. And if you had a bad reference then even better! Sometimes it's about seeing what's not there too. Even tho we all know that goes against what we are trying not to do......hope that made sense.
Great job! The sunglasses are particularly good but the smile is all his. This is only my opinion but his face seems dirty so be careful with the skin tones. And since I don't draw great skin tones, I'm no help. I love this!