Go into the shop & show him the pics and say this is what I want. He will say OK. Then push him against the wall-put a large Bowie knife at his neck and say This is what I really want.
If he fails to give you the desired haircut, then cut a Swastika in his face and next time he will be more careful.
Side note-unlike the Rambo movies, no one attempted to aftermarket those knives. Missed commercial opportunity.