I get the sense by looking at him. He is wearing facial prosthetics specificly to not look like a modern human:
I like playing big, ridiculous characters and I have always been fascinated by special effects and prosthetic make-up which is lucky because the other guys have been very open in saying they would not enjoy having to put on Robin’s make-up every day. Complete costume and make up for Robin takes about two and a half hours to put on and about 45 minutes to get it all off. The most it has ever taken is four hours. There are many different elements involved; there are a couple of prosthetic pieces and then some more traditional make-up techniques are used as well.