The main colour used here is black; this represents danger and death - both of which occur during the battle that is pictured in the poster. This suggests that the Volturi have come to kill and will stop at nothing to achieve this; that the Cullens and both Werewolf packs will fight against them to protect Renesmee, this could link to the fact that the werewolves have to protect humans that another has imprinted upon.
The producer of the poster has created it so that it looks like the Volturi army keeps going forever, when really it is just a tree line. But the fact that they all wear black capes creates a sinister and powerful atmosphere, all of which is shattered when Alice shows Aro her vision of the battle and reveals Bella's skill, rendering their's useful.
The title of the film is in gold to stand out from the rest of the poster; so that the audience will notice it straight away.
THE EPIC FINALE THAT WILL LIVE FOREVER could relate to the battle; the Volturi's first ever defeat or Renesmee as we learn that she too will live forever.
I think this poster is most effective out of all five, because it definitely entices the reader into discovering the outcome of the battle.
Amy