As premiered during the Man of Steel fan event just a few moments ago, and currently up for auction for We Can Be Heroes.
In turn, these are by Alex Pardee, Jonathan Wayshak and David Correia.
There are some detailed close-ups at eBay. Go see if the bidding is in your price range.
These images were created specifically to raise money and the brief was simply for the artists to respond to the Superman plus Batman notion of the next film.