I got 85% of the tattoo this past weekend. On 9/3 I am going back to finish it. He quoted me at $300-$400 and when I left that day he said it'll be $350. Does that cover the whole tattoo or will I need to pay more when I go back? Also, what's a good tip for a $350 tattoo? He did a great job so far and I couldn't be happier. And do I just hand him $50 or whatever and say here's your tip? Thanks.