Got these Arkahm figures recently as I was so into the game.
I'm so impressed with the sculpt and the articulation, it was such great fun simply spending an hour playing with them. However, I should say the paint job is quite disappointing as it looks unfinished.

So I started with Batman's suit, I used a metalic black as the base color and brushed on some silver for his chest and abs. The same to the boots and gauntlets, just with less ink application.

For Harley, I just felt her face was way too plastic, so I wiped out her brows and eyes with some white paints and repaint the detail on top of it. I finished it off with an eye shadow which is from ground pastel.

Hope you enjoy!