japanese gravure idol in our gallery and western poster girls

I am not sure if it's the way the photographer tries to make the japanese gravure girls look pure and untainted and all that stuff, but whenever I check the pics that people comment on, I could immediately tell whether the idol is AV or just regular gravure. it's obvious even in the thumbnail. it's not just about the posing or the swimsuit they are wearing, it's the whole communication with the camera. either the photographer specifically designed it, or the regular gravre girls just suck at this compare to jav girls

on the other hand, I couldn't tell whether the western poster girls are porn stars, playmates, or just some maxim/fhm girl. they are all so damn good at posing for the cameras.