I picked up the film Seven Psychopaths over the weekend which has a great performance from Christopher Walken. The movie was a surprise for me as I got worn out by the film's trailer and promotions towards it's release. So I decided to pass but began hearing how awesome it was from friends who have seen it. Here's a feeble attempt at a Walken sketch. These can't all be winners, folks. I tried to play around and really exaggerate his features but also tried too hard to make it look like him.
Sometimes when you just focus on the features of the face that really stand out and push the exaggeration, then playfulness of the caricature comes through and that resemblance you are looking for just happens naturally.