As a fan of the anime this is based off of, I must first applaud the choice of your piece!
The application of realism to an anime character isn't easy, though I think this was a well executed attempt at making something unrealistic become a bit more believable. In this, I say well done!
I feel the picture doesn't reflect the personality of the character very well, as Allen Walker is typically an easy going and oft smiling person when he isn't fighting something or found in a serious situation. If this was listed as more of a practice piece, or a means of studying the character, I would think less on my above statement. Though the base of your character choice should have some reflection of who it's supposed to be, and the associated personality to that character, I think.
Beyond that, I really do appreciate this work, and think highly of its execution!
Oh wow...the more I look at it, the better it gets. I don't understand how someone can make such a realistic pictue that is so good. Transferring an anime character to realistic is very hard so you must be really talented.