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Okay. let's go to the explanations ...
well, before making any poster of any movie, I imagine the film itself.
setting, characters, characterization ...
I'm aware that a supergirl's movie is not the same category of a TDK. But nonetheless, I think it would make a good movie with the right script (I don't think it would be good choice based on the comics it).
So, as I imagined the movie, the heroes would already be established in the world, Superman would have already glorified as the greatest protector of the earth, and that is the ambiance that would appear Supergirl, a teenager who fell in life of the super, with startling news of their native planet.
The "S" brilliantly created by Medusone:[http://medusone.deviantart.com/gallery/]
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