Oh when the imps...go marching in.....toot toot
But I know the difference - A) real French horns haven't had piston valves in nearly sixty years, and; B) real French horns are much more twisty, and, worst of ALL; C) that picture looks suspiciously like you're using a TRUMPET mouthpiece. Sacrilege! Blasphemy! Good lord, girl - run, don't walk, down to your local music store and demand an adapter so that you can use a REAL horn player's mouthpiece! ;)