BEST USED WITH THIS SKIN: http://www.fpsbanana.com/skins/45610
This is quite simple really, just a few overlays and some symbols here'n'there. but it gives the spy a more.... proffesional look in my opinion. I'll let you have you're own views about em'.
These are, as I pointed out above, best used with t2vanden's Unmasked spy (I have the one with stubble.) but otherwise they have whatever head you have on them.