Looks like a toned-down Pertwee.
So, lately, I've been listening to a bunch of Big Finish audios, namely Oh No It Isn't! (the first in a Doctor Who spinoff based on novel character Professor Bernice Summerfield), The Valley of Death (originally meant for Tom Baker's time, and written for him based on an initial outline), Doctor Who and the Pirates (featuring Bill Oddie as a psychotic pirate and a musical third episode), and Colditz (a historical with a time travel twist).
Have you seen the size of human brains? They're hilarious!
-The Twelfth Doctor