Over the last week or so, French pop artist Grégoire Leon Guillemin has been posting a new series "The Secret Life of Heroes" to his Tumblr (careful now, there's some NSFW content at that link). The Pop Art-influenced work offers glimpses of iconic superheroes captured in the sorts of candid moments you'll probably/hopefully/thankfully never see in a comic book.  If you like them, he's also selling prints via Society 6. More examples below: