where the rainbow begins near the bridge of his nose... don't make it rounded off at the end, make it straight and following the same angle as his nose (i know his nose is rounded, but it starts at a fairly straight angle).
make "john mayer" flow better with the bg.
the shit that is repeated from the neck, over his guitar where it is plugged in should follow the same displacement pattern as his shirt. just make sure that the methods for displacing his shirt/guitar are not the same as anything in the bg because it will then look like forground=background, and it doesn't appear that you want that.
notes from mouth =
but...
it actually pretty much rawks. nice stuff holmes.