A brief back round: In Arkham City you meet Hush, he has killed several people and has put together Bruce Waynes face. Hush's intent is to become like Bruce so he can ruin Bruce by committing all kinds of crimes i.e. murder etc.
This may look simple but it is actually more of a job than just swapping heads. I used a head from a AC S1 Infected Batman, body of AC S2 hush. When I did the head swap I noticed Hush's pegs were thicker than Batmans. I had to drill into Bmans head to widen the peg cavity. Once the head was on I partially painted the face and added the blood/bruise affect on the cut lines.I tried to make it look like 3 different skin colors. I then painted the stitching which was very hard with the brushes I have.
Since I had the extra head and body I did a Hush as Batman. I know in the game it does not indicate he knows Batmans identity, but in the comic book it does. I thought this was a sinister idea. You can see that partial custom in the attached pictures.
I am happy with the final product. I wish I got in the game of customizing sooner. I am sure I missed out on a lot of cool Arkham Customs.