Fashion designer Jasper Conran stood out to me while watching a program on Sweden's equivalent to BBC's iPlayer (available until 9th Dec, 2009). I thought he had such a caricature-friendly face.
It seems that capturing likenesses is easier if you push the caricature aspect.
It's quite liberating. Instead of meticulously trying to reproduce what you see in the exact relationships that you see it, focus on getting the prominent features down first (the chin and the nose in particular in this case) and working everything around that. It could bring it closer to home.
Caricature could be described as picking out and magnifying flaws, but I wouldn't necessarily think of prominent features as flaws. It's wonderful how different people are, let's celebrate that diversity!
Oh, here's another one of the 2009 Eurovision Song Contest winner, Alexander Rybak (whose song I was rooting for from the moment I heard it, by the way - he has great energy!).