I use Topaz Remask and it works fine for me in all respects. I'm not sure of how you approached shooting this image. Did you use a tripod and light stand that stayed put, and just had the cosplayer move to different locations? If this is the case, then you don't need to cut around the hair at all. You can just apply a layer mask and loosely mask around the cosplayer since tha background will be the same as your base background. Get what I mean?
If that's not the case, and all of these were taken at a different location and you edited them all in to this background, then you did a superb job with the shadows and lighting details. In this case, I agree with Bruce and you should shoot behind a white background or a black background, because then you can just change the layer with a cosplayer on it to Multiply or Lighter Color to get a stark contrast around the hair, then just duplicate the layer and change the blend mode back to normal and then mask in the parts that are identical to background color that wouldn't show up on multiply or lighter color blend mode.
EDIT: I will say that I've had this idea with Naruto for a long time but just never found a naruto cosplayer that I've been particularly fond of. Maybe this year at AX I will. This piece is a job well done.
Last edited by TykeJack : 04-23-2012 at 12:43 PM.