Originally Posted by NickPapageorgio

Then you should have done a little more investigating of his past works. A good tattoo artist doesn't turn skill on and off. A good tattoo artist produces good tattoos. If you convey what you are looking for properly, have checked his past work and haven't pissed him off, things should always turn out right.

As far as tip goes, I always tip ATLEAST 15% on the entire price of the tattoo. More if I am so inclined but never less than that.