This is fascinating and offers great insight.
I would point out, however, that the one country that significantly altered the man's appearance is the country where arguably the majority of the world's images come from (eg in the film and television industries - Hollywood etc). So the world is being disproportionately exposed to the American ideals Obviously every country has its own film, tv and modelling industries from which a significant amount of the images its citizens are exposed to come, and these will dilute the effect of the American images to a degree but we may still be moving slowly towards the American ideal everywhere. I would be interested to see the study repeated in 5 or 10 years.
Also, if you're not in Bangladesh, Indonesia etc you aren't going to be exposed to their images of the perfect man very often. So for most people the result will maybe be a halfway point between their country's photoshop standard and the US standard.