This pic is awesome. But who's it supposed to be? A brown hair samus or a random person in samus's clothing?

Might be the female Federation Trooper from Echos (or was it Corruption) who admired Samus.

It's from Fatal Frame 4. I believe the character is Ruka Minatsuki.

If I remember correctly a skin was released in
Fatal Frame IV: Mask of the Lunar Eclipse.

http://www.youtube.com/watch?v=WxR8iPaEOAk&feature=player_embedded

Oh, no! It's Another M