Concept art by Brian Matyas
I found some neat Batman concept art on Artstation that I thought y'all might appreciate. The artist is Brian Matyas and here's a link to his whole Artstation: https://www.artstation.com/bmatyas
He was responsible for Lady Arkham's entire design and Harvey Dent's levels of crispiness.
Lady Arkham's design: the first pic is what we got in-game, the second was before her gender was written as a twist.
And finally Bats' Season 2 design: there's also a nice pic demonstrating his 3D model in that post
(gosh I really love this one tbh but the one we got is nice too)
I just saved and posted my favourite images, but there's heaps more on his Artstation account (linked at the top of the post- I encourage you to have a look for yourself!). He's also got some Guardians of the Galaxy stuff if that's your kinda thing.