Very cool, I like the collage idea and the abstract look it so fits the show.
But though if I had to say anything for friendly advice I would say I would find the same scan of Jin but in better quality because his scan doesn't match the quality of the Mugen one. Or if you want to use the same one maybe you could duplicate the scan and blur it on a low opacity .? But I doubt it will look much better. I would just use and extract a new scan of him.
Also you need to extract them a little better because the edges of the scans of them are jagged. Especially Mugen. Use the lasso tool, and by zooming in on them by 400 to 500 percent and extracting them slowly with the feather on 1px to make sure the extract is clean.
Besides that I like the idea of the wallpaper and where you positioned things.