It's always fascinating to see concept art from these big budget films, mostly because it shows where fantasy and reality collide. The fantasy here is the size of Doomsday—or the Zod/Luthor hybrid creature masquerading as Doomsday anyway—who was apparently intended to be much larger than he ended up being in Batman v Superman. Honestly, Doomsday was one of my lesser complaints about the film, as it was awfully stupid, but not offensively so in the way "Save Martha" was.
Below you'll find a gallery of concept art from the film, showing that an AWFUL lot of thought went into crafting Batman's kryptonite murder spear. There's also shots of Bruce Wayne's house, the LexCorp building, and a number of other action sequences from the film, all of which were done by Christian Lorenz Scheurer, who worked on Man of Steel and Thor: The Dark World among other films. While I'm glad that Doomsday didn't turn out like this concept art, it's nice to know that every once in a while, Zack Snyder knows how to pull back.