Yup, that's a bloke chilling out with his gee-tar next to a nice big picture window IN SPACE.
Photo c/o of current mission shutterbug Soichi Noguchi, who tweets 'em direct thanks to the ISS's new direct internet link. Lots more, all good, in his twitpics, but this one is the best illo of the cupola in context... and what a context. I get future shock from this shot.
The first fecker to pull out a tambourine and a happy clappy song book get's airlocked.
Go for a complete tour through the ISS here.