So you're a role-player, huh? Interesting. Let's get down to it, shall we?
Vision: I'm not exactly a fan of Kuroshitsuji at all, but this picture is definitely something worth seeing. Excellent representation! Four stars. Originality: The Black Butler from Kuroshitsuji is most definitely a man in black, but that's what anime fans like about him. You play the part so well, by the way! Four stars. Technique: What kind of outfit did you buy to make this work, dare I ask? 'Cause whatever the cost, it was worth it. Four and-a-half stars. Impact: Kuroshitsuji fans will fall in love with this! Four stars.
Overall, I think this deviation is a fine example of representation and accuracy. Keep doing what you do, and don't stop!
I like your work - really - this cosplay is good - but the hand appear to wide in this angle. Sebastian is thin - very thin - you are thin too - the hand are the one think that ruins a good picture. The face and hair is ok - a devilish smile would be appreciated.
To the picture itself - black and white - good choice - when the light is not ideal. The white block in the left-down would not be such a problem if you are (or or the one who have make the picture) standing a a little bit far from that.
Angle of the hads and the white block (or your position to that) - and the picture would have been much better.