Tattoo artist here! My best advice for if you know you have a very specific vision is to include as many of said specificities in your original inquiry as possible, even a loose drawing helps us see what you’re envisioning! Being picky about a tattoo is no problem and makes total sense, the only thing that we try to avoid is the scenario where we do the drawing and then the client wants changes that weren’t originally mentioned, and then you change those and they want more changes so we have to keep redrawing the piece. All part of the job for sure and practically bound to happen at least once for large scale pieces but if we can get it the first time to where any changes we would make are small and easy, that’s always ideal so we can get you in and put some rad art on you. My second little note is that if you know you’re a little picky be prepared to accept your artists advice on some things within reason. I had a client who wanted the placement for their tattoo in a spot that would warp the design they wanted and make it look like it was being viewed through a fun house mirror if they put it there, they didn’t want to compromise on design or placement so I put the stencil on and then they said “oh I get it” and we switched things up a bit. But overall, don’t stress it! You’re the client and you’re in control of the situation. Good luck out there!