The artwork itself is very well done, great attention to detail, everything is in correct proportion, good perspective, lighting and shading and you've avoided bright colours which obviously don't suit Batman.
You've based Wayne and Pennyworth on Bale and Caine, but you've modified them to make them more generic (Bale is not as tall as Caine) and I notice Wayne also resembles Michael Keaton a little.
What I like most is the double meaning behind the art, it's still Bruce Wayne in every version but he can be a "different" person based on what costume he's wearing similar to how Batman becomes a different character when different film makers take a different approach to the character.