Artistic license is great but....it's your head. You already have a vision of what you want and it would be a great sorrow if what you got wasn't what you wanted. Even quite what you wanted. Not to offend your tattooist but....I think I'd ask for some preliminary sketches. This is something you both wish to be proud of and he, as much as you, wants to provide the work of art you both want.
At 67 I'm just beginning to acquire skin art. My feeling is by the time I'm dumped in my crypt, not much could have faded or run. Bravo to you and all the guys who get inked in their prime rather than in their desire to be like everyone else.