"... which I have since deleted." -- Yeah, right
"The vast majority of them do not contain nudity" -- How big a sample do you need to take in order to summarise that much media content?
"Of those that do contain nudity, most do not show a face." -- I didn't the a person's face was the point of nudie photos?
"... no photos in the sample I examined featuring nudes of obviously under age subjects." -- So as long as someone isn't obviously underage, it's Ok?
"Of the photos that did feature nudity and a recognizable face, several were of professional models," -- And the others were his mates?
"and one had a Playboy logo in the corner." -- Call the lawyers!