Thanks a lot.
Actually you should do more caricatures. You nailed the guy in a friendly, nice way (often caricatures are a bit nasty), and now that I know the quite meager reference I can appreciate your model even more. It's really well done (and your work says not only something about the person shown but about you, too)..
But as an aside: While it's really interesting to actually see the reference (and I didn't hope for it), it shouldn't be here (it even could create some legal grief as it's against his personal rights and so on). So it would be best to delete it in your post.
But it's really well done