rules, standards, philosophies, agendas, schools of thought, etc, should AT MOST be taken as suggestions. when you're no longer a beginner, they are AT BEST optional.
hmm. this poster is pretty cool. there's something a little off about it but that's a good thing, gives it a certain unsettled energy. when a composition is perfectly stable or symmetrical, it's kind of dead. the imagery to me suggests a pun on "hold steady", like the finger is kind of pressing a shutter and the photo suggests holding still, posing, for a snapshot.