this is exactly what i planned to do with my car! but not anymore. at least for now... but your bottom black area looks painted and matte. if so, paint the deck panel matte.
all i can say is you should go here and check out their stuff. they might have a gloss graphic for the lower area. and i suggest tinting your tail lights in some way. i was gonna honeycomb. ALSO, get the black mustang letters from american muscle. do that and tint the lights and choose gloss or matte (choose matte WAY better) and your car's ass will look hotter than hell.