It is a bit hard to see, but he has a vertical scar over his right eye, and a x shaped scar on his left cheek.
Hope these help. For a refrence about his behavior you can just browse through his wiki if ya want.
Peace is not my profession, it is yours. War is my profession. Should you fail at your job, I will not fail at mine.
Lan Darklyn's Wiki
Lan Darklyn's Wiki