The source of the misinformation on the Devil's face two dollar Canadian note seems to have been a satirical article found here: http://www.agencetopo.qc.ca/
devilface/eng.html .

Peter-Dirk Uys was never a photographer, or even existed - it's just a misspelling of Pieter-Dirk Uys, a well-known South African comedian who was born in 1945. (They also misspelled Elizabeth throughout the article!)

Personally I've never been able to see a real face in her hair, just some highlights that with a lot of imagination could be imagined to be a nose, eyes, etc. The highlights are in the original photograph of Princess Elizabeth taken in 1951 by Karsh of Ottawa, although the hair in the engraving made from the photo was modified to remove the tiara that she wore as a princess.