The ones the client don't micromanage.
My first tattoo was a sleeve and chest panel. I said, "Japanese style, do anything you want."
I was going to get a kapala skull on my back but the day I walked in to my appointment my artist said, "I'm just not feeling that, what would you think about a Hannya mask?" I said, let's do it and I think it turned out great.
I think he's done some of his best work on me because I let him do things he is excited to do.