SO this is heavily inspired by "Iron" by Woodkid - aka that famous song used for the trailer of Assassin's Creed: Revelations.
I think this should be Seb's theme song, I'm not even kidding rofl. It suits him so well. A lone wolf in the - in this case- desert. I suppose this picture is a snapshot of his life prior to working for Jim. Perhaps he got captured by terrorists during a one man military infiltration. Somehow he would get away like a BAMF just like Ezio did.
Oh, and the bg is just a painted over photo found on google roflsob
100 TC- 14. Smile
Sebastian Moran (interp?) (c) BBC Sherlock
art (c) Inklou