Someone merged all the Doctors together to find Doctor Who’s “average” face

One of the secrets of Doctor Who’s longevity is the way the show’s producers found, early on, a way to create a star-driven show that could replace said star whenever he decided to retire. Thanks to the miracle/plot device of regeneration, the Doctor can take any form possible in his decade-spanning career (so long as said form happens to be that of a British white guy).
The Doctor has been old, young, ginger, blonde, monochrome, puckish, smiling, stern, and every other variant in the vast, diverse rainbow that is possible white-guy looks. But what is his true appearance? Or, at least, his average appearance—the one that all those different actors combine to make?