I'd thought about doing the original theatrical poster for the film, with Superman and Wonder Woman as Sky and Sarah and Batman and Catwoman as Nathan and Adelaide, but you can immediately see why I didn't:
There's nothing really distinctive about it. It's a pretty generic image that, without the movie credits, could be anything. The promo pic with Brando and the showgirls had more pop to it. And it's fun to imagine that Diana/Sarah is laying her claim to Superman/Sky even amidst all the other ladies.
And admittedly, the way Batman fans brag about how Batman is such a pimp that he can and should bag every single woman in the DCU, it's fun to see Superman getting his due for once.