I dont see any pic with your post so do you mean these?
Not played the game so dont know how accurate they are but I feel the Batman is a bit to blue on cape/cowl/boots etc. The feeling I get for the game is very dark and the colours just seem too lively.
Joker just looks like Joker nothing new really.
Scarecrow looks very different I can understand the gasmask but the hands have me stumped. I dont know what his latest look is like so the metal and the weird hand I dont get.
Harley Quinn I really like the gothie nurse look....Furrh, Humm....Nurse The screens!
The reason Scarecrow has the metal hand is because that's the contraption he wears on his arm to spread the fear gas. There should be syringes at the end of his fingers, but he would use that glove to inject the fear gas into his victims (including Batman, multiple times).