D.Gray man

Well, where to begin?
The firist thing that stood out to me, when I first saw this, was the coustumes.
I like them, and the authenticity is great quality, but the thing that made me cringe was how new they looked. Now I am not one to talk, being I admire that clean look just as much as the next OCD person, but when cosplay comes to form, I always remember to scruff it up a bit. What I mean by that is not vandalize the coustumes, but rather give them a more used and authentic visual. I highly doubt that the characters who you protray would look so brand-new. Honestly there is nothing wrong with that, and I almost cry whenever I take the seam-ripper to that fresh and clean outfit that cost me an arm or two, but it depends on how much you are willing to give to look more "real".
If you don'y understand my ramblings, I can easily simplify it. The point is, I would give the coustumes a more authentic "used" look, such as small tears, maybe a bit of "dirt" and some frayed edges.
Next, I don't know if you have picked up on this, but many cosplayers go for the blue and green tints when it comes to Lenalee and Kanda's hair. I don't know if the two were wearing wigs above, but if so, maybe next time (if there is a next time) add the tints. If it isn't a wog (<img src="e.deviantart.net/emoticons/e/e…" width="15" height="15" alt="" title=" (Eek)"/>) then I would recommend those nice non-permanant bottles of spray on hair color. Or you could leave it be, like I said, not the most important detail.
Uh, on Lenalee maybe a more asian makeup (don't mean to be racist) like eyeliner flared up on the edges, though ethnic orgin really cannot be helped.
Now, I just love your expressions! So in character and just wonderful. The bare background is also a nice touch and draws more attention to you rather than the scene itself.
Was photoshopped used? Just wondering because where are the facial blemishes? Dark circles, I see none.
One thing I would have done for Kanda, I would have darkened the area beneath his(? I cannot tell cause of the hair and eyes.) eyes. This gives a more angry and tired look, that most of us D. Gray Man fans associate with Kanda.
Other than that, the slight scowl or lack of a smile is really in character.
I would just like to say good job! <img src="e.deviantart.net/emoticons/b/b…" width="15" height="15" alt="" title=" (Big Grin)"/>