Tips
The first tip is to be as specific as possible. If you have a picture of the tattoo you want, then show it to the tattoo artist. The more information you can provide, the closer the tattoo will be to your expectations. Other tips include the following;
Allow for artistic license: Remember that you are working with an artist, not a photographer. There is going to be some variation, so you will need to accept it and make it part of the tattoo.
Understand the Time Commitment: This is not a one-and-done process. Many sleeve tattoos take multiple sessions and even years to create.
Go for Quality: Remember that a tattoo is a lifetime investment, so treat it as such. Find the best tattoo artist who fits your budget, not the cheapest.