Choosing a tattoo is very important. Here are three ways for how to choose a tattoo the right way.
Personality - Getting ink based on your personality is a great choice. If you are outgoing and want to reflect that in your ink then you can choose a strong bold design that speaks loudly on the skin. If you are more laid back, discreet, or ninja-like, then a subtle yet strong design can work. Something that doesn't scream out, yet holds it's own as a solid and strong work. Maybe you hold both of these qualities? You can pick a design which represents both, or two different designs showing your different sides.
Goals - What kind of individual do you strive to be? What are some of the qualities you yearn for? Your tattoo choice based on the goals you have or strive to have is a great idea for ink. Think of strong qualities you want to represent and remember on a daily basis. This is actually a great tool for constantly remembering your goals or character traits you desire to have, and then pushing forth to accomplish them.
Individuals - People who you want to remember or people who have inspired you are great tattoo choices. You don't have to do a straight face or name representation, but rather you could choose a symbol or design that reflects that person. It can be personal and only obvious to you, or you can choose a more obvious representation as in a face or name.