Artist Carlos D'Anda has released some previously unseen illustrations behind the development of Arkham Asylum that show some insight into the development of the game, and how to look at a character like Batman as a game character, thinking about what would upgrade and how that would look. The art is greatly done and it's really interesting to see what didn't make it or how things changed along the way. Check out some more pictures in the gallery after the break, or head to D'Anda's DeviantArt page for all of them.